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A1 noun #3,627 most common 9 min read

外部

gaibu Top 3,627

Practice it Examples Notes & Tips 外部 in 30 Seconds

Explanation 外部 in your Level:

At the A1 level, learners should understand 'gaibu' as a formal way to say 'outside.' While you might primarily use 'soto' (outside) for daily life, you will see 'gaibu' on signs or in simple instructions. It helps to think of it as the 'external part' of something. For example, if you have a toy box, the 'gaibu' is the colorful part you see on the shelf. You don't need to use it in complex sentences yet; just recognizing that 'gai' means 'outside' is a great start. Focus on simple phrases like 'gaibu no hito' (an outside person) to understand that it refers to someone who doesn't belong to a group.

At the A2 level, you can begin to use 'gaibu' to describe simple organizational boundaries. You might use it when talking about your school or a small club. For instance, if you are planning a party and someone who isn't in your class wants to come, they are a person from the 'gaibu.' You will also see this word in basic technology contexts, like 'gaibu memori' (external memory) for your phone or computer. Start practicing the 'gaibu no [Noun]' pattern. This will help you sound more professional than just using 'soto' all the time. It's about moving from physical space to social space.

By B1, you should be comfortable using 'gaibu' in business or formal situations. You will encounter it in emails and reports. For example, you might write about 'gaibu no iken' (outside opinions) or 'gaibu no koushi' (external lecturers). At this level, you should also understand its antonym 'naibu' (internal). Being able to contrast 'gaibu' and 'naibu' is a key skill for discussing systems, companies, or projects. You'll also start to see it in news stories about 'gaibu atsuryoku' (external pressure) on the government or companies, which requires a more abstract understanding of boundaries.

At the B2 level, 'gaibu' becomes a tool for detailed analysis. You will use it to discuss 'gaibu youin' (external factors) in a scientific or economic context. You should understand how external stimuli ('gaibu shigeki') affect behavior or systems. Your usage should be precise—distinguishing between 'gaibu' (the area/entity outside) and 'gaimen' (the surface appearance). You will also encounter 'gaibu' in legal or official documents, such as 'gaibu kansa' (external audit). At this stage, you are expected to understand the nuance of when 'gaibu' is more appropriate than 'shagai' (outside the company) or 'okugai' (outdoors).

At the C1 level, you will encounter 'gaibu' in complex philosophical, sociological, and high-level academic texts. You should be able to discuss the 'gaibu-sei' (externality) of a system or the way a person internalizes 'gaibu' influences. The word is used to describe the boundaries of the self and society. You will see it in literature to describe the world beyond a character's immediate surroundings. Your ability to use 'gaibu' should be natural and contextually perfect, reflecting a deep understanding of Japanese 'uchi-soto' dynamics. You should be able to navigate the subtle social implications of calling someone a 'gaibu no hito' versus a 'bugaisha.'

At the C2 level, 'gaibu' is a concept you can manipulate with full native-like proficiency. You understand its role in the structuralist analysis of Japanese society. You can use it in high-level policy-making, legal debates, or theoretical physics (e.g., external forces on a closed system). You are aware of the historical evolution of the word and its kanji. You can detect the subtle tone of voice when a speaker uses 'gaibu' to create a sense of professional distance or to avoid personal responsibility. Your mastery includes all technical compounds and the ability to explain the concept to others with nuance and clarity.

Practice it Examples Notes & Tips

外部 in 30 Seconds

Gaibu means 'outside' or 'external' and is used for physical exteriors and organizational boundaries.
It is a formal noun, often appearing in business, IT, and technical Japanese contexts.
The word is the direct antonym of 'naibu' (internal) and is more professional than 'soto'.
Commonly used with the particle 'no' to describe external people, memory, or factors.

The Japanese word 外部 (がいぶ - gaibu) is a fundamental noun that translates to "outside," "exterior," or "external." At its core, it describes the space or the entities that exist beyond a defined boundary. This boundary can be physical, such as the walls of a building, or conceptual, such as the membership of a company, a family, or a social circle. Understanding gaibu is essential for navigating Japanese social dynamics, which often emphasize the distinction between the inside (uchi) and the outside (soto).

Physical Exterior: In a literal sense, gaibu refers to the outer part of an object. For example, the casing of a machine or the outer walls of a structure are its gaibu. If a device is damaged on the outside but functional on the inside, you would describe the damage as being on the gaibu.

この箱の外部はとてもきれいです。(The outside of this box is very beautiful.)

Organizational Outsiders: In business and formal settings, gaibu refers to people or organizations that are not part of the internal group. This includes consultants, contractors, or the general public. A "gaibu no hito" (person from the outside) is someone who does not belong to the specific company or group being discussed.

外部の人には秘密にしてください。(Please keep this a secret from people outside the organization.)

The word is composed of two kanji: 外 (gai) meaning "outside" and 部 (bu) meaning "part" or "section." Together, they literally mean the "outside part." This structural clarity makes it very common in technical and academic literature as well. Whether discussing external storage for a computer (gaibu memori) or external pressure on a political system (gaibu atsuryoku), the word maintains its core meaning of something originating from beyond the primary entity's borders.

Abstract Boundaries: Beyond physical and organizational uses, gaibu is used for abstract influences. If a person's decision is influenced by factors they cannot control, those are gaibu no youin (external factors). This level of usage is frequent in news reports and scientific papers.

成功は外部の影響を受けます。(Success is influenced by external factors.)

In summary, gaibu is a versatile word that scales from the physical to the philosophical. While an A1 learner might first see it on a sign or in a simple sentence about a box, they will soon encounter it in every professional interaction. It is the formal counterpart to the simpler word soto, providing a more clinical and precise way to define boundaries.

Using 外部 (gaibu) correctly requires understanding its grammatical role as a noun. While it means "outside," it often functions as a modifier for other nouns using the particle の (no). This allows you to describe things like external people, external pressure, or external memory. It can also stand alone as the subject or object of a sentence when referring to the general concept of the exterior.

The 'Gaibu no' Pattern: This is the most common way to use the word. By placing gaibu no before another noun, you define that noun as being external to the group or object in focus. For example, gaibu no senmonka means "an outside expert."

外部の意見を聞きましょう。(Let's listen to an outside opinion.)

Directional Usage: When combined with particles like e (to), kara (from), or ni (in/at), gaibu indicates direction or location relative to the boundary. Gaibu kara means "from the outside," often used when talking about information leaks or external attacks.

情報は外部に漏れました。(The information leaked to the outside.)

In technical contexts, gaibu is often part of compound nouns. You don't always need the no particle in these cases. For instance, gaibu-shigeki (external stimulus) is a single conceptual unit in psychology or biology. This compounding is a hallmark of formal Japanese, where kanji are stacked to create precise terminology.

Contrast with Internal: Sentences often use gaibu alongside its antonym naibu (internal). This contrast helps clarify that everything both inside and outside the system is being considered.

内部と外部を点検します。(We will inspect the interior and the exterior.)

Finally, consider the level of formality. If you are talking to a friend about a ball falling "outside" the court, use soto. If you are writing a report about a data breach involving "external" hackers, use gaibu. The choice of word signals your professional competence and your understanding of the context's gravity. By mastering these patterns, you can transition from basic Japanese to a more sophisticated level of communication.

The word 外部 (gaibu) is ubiquitous in specific environments, particularly those involving security, technology, and corporate management. If you live or work in Japan, you will encounter this word in places where boundaries are strictly maintained. It is less likely to be heard at a casual dinner party but very likely to appear in a morning meeting or a news broadcast.

Corporate and Business Meetings: In the Japanese workplace, the distinction between the company (uchi) and the rest of the world (soto/gaibu) is vital. You will hear managers talk about gaibu ittu (outsourcing) or gaibu koushou (external negotiations). It is used to categorize stakeholders who are not employees.

外部委託を検討しています。(We are considering outsourcing.)

IT and Cybersecurity: In the digital age, gaibu is used constantly to refer to external storage, external networks, and external threats. If you use a computer in Japanese, you will see gaibu sutoreeji (external storage) in the settings menu.

外部からのアクセスを遮断しました。(We blocked access from the outside.)

Another common place to hear gaibu is in educational settings. Schools often invite gaibu koushi (external lecturers) to give special talks. This highlights that the speaker is not a regular member of the faculty but a guest with specialized knowledge. It maintains a respectful distance while acknowledging their expertise.

Public Safety and Signage: Signs at construction sites or high-security facilities might use gaibu to warn unauthorized people. Phrases like "gaibusha tachiiri kinshi" (no entry for outsiders) are common sights in urban Japan.

外部者の立ち入りを禁じます。(Entry by outsiders is prohibited.)

In summary, gaibu is a word of boundaries. Wherever there is a fence, a firewall, or a corporate hierarchy, gaibu is the word used to describe what lies beyond. By paying attention to these contexts, you will start to hear the word much more frequently than you might expect for a "formal" term.

Learning 外部 (gaibu) can be tricky because Japanese has several words for "outside." The most common mistake for English speakers is overusing gaibu in casual contexts or confusing it with the simpler word soto. Understanding the nuance of formality and physical vs. conceptual boundaries is key to avoiding these errors.

Mistake 1: Casual Overuse: If you want to say "Let's go outside" to a friend, you should say Soto ni ikou. Saying Gaibu ni ikou would sound like you are suggesting an excursion to the exterior of a containment vessel or leaving a corporate entity. It is far too stiff for daily life.

❌ 外部で遊びましょう。(Incorrect: Let's play in the 'external'.)

Mistake 2: Confusing with 'Gaimen': Gaimen refers specifically to the surface or appearance of something. Gaibu is the general area outside. If you are talking about the surface of a fruit, gaimen is better. If you are talking about the space outside the fruit, gaibu is used.

❌ このスマホの外部はガラスです。(Incorrect: The 'external' of this phone is glass—should be 'surface'.)

Another common error involves the particle choice. Beginners often forget the no particle when using gaibu to describe another noun. Remember, gaibu is a noun, not an adjective. You cannot say gaibu hito; it must be gaibu no hito.

Mistake 3: Misapplying 'Gaibu' to People: While gaibu no hito is correct for business, you wouldn't use it for a stranger on the street. That person is a shiranai hito (unknown person). Gaibu implies a relationship to a specific group that the person is not part of.

Finally, be careful with the word igai (besides/other than). While igai also deals with things "outside" a set, it is used for lists and exclusions. Gaibu is for spatial or organizational boundaries. Confusing these two can make your Japanese sound very unnatural to native speakers.

Japanese has a rich vocabulary for expressing the concept of "outside." Depending on whether you are talking about a physical location, a social group, or a technical surface, you will need to choose the right word. Here is how 外部 (gaibu) compares to its closest relatives.

外 (Soto): Soto is the general, casual word for "outside." It is used for the outdoors, the area outside a house, or any non-specific exterior. Gaibu is the more formal, technical version of soto.

屋外 (Okugai): Okugai literally means "outside the building." It is the formal word for "outdoors." While gaibu can refer to people or concepts, okugai is strictly about physical space outside a roofed structure.

屋外でイベントを行います。(We will hold the event outdoors.)

社外 (Shagai): Shagai means "outside the company." This is a more specific version of gaibu. Use shagai when you want to emphasize that something is happening outside your specific workplace.

Another word to consider is gaimen (surface/exterior appearance). While gaibu refers to the space or entity as a whole, gaimen is about the facade or the part you can see. In psychology, gaimen refers to a person's outer behavior, while gaibu refers to external influences on that person.

部外 (Bugai): Bugai is usually seen in the term bugaisha (outsider/bystander). It specifically refers to someone who is not involved in a particular matter or department. It carries a slightly stronger sense of exclusion than gaibu.

Choosing the right word involves identifying the specific boundary you are crossing. Is it a wall? Use soto or okugai. Is it a company? Use shagai or gaibu. Is it a specific matter or project? Use bugai. Understanding these nuances will help you communicate with precision and cultural sensitivity.

How Formal Is It?

Fun Fact

The character '外' originally depicted a moon and a divining bone, suggesting things happening 'outside' the normal daytime or inside rituals.

Pronunciation Guide

UK ɡa.i.bu

US ɡa.i.bu

In Japanese pitch accent, 'gaibu' typically has an 'Atamadaka' (head-high) pattern, where the first syllable is high and the rest are low: GA-i-bu.

Rhymes With

内包 (naihou) 配布 (haifu) 細部 (saibu) 背負う (seou - near rhyme) 財布 (saifu) 大部 (taibu) 内部 (naibu) 一部 (ichibu)

Common Errors

Pronouncing it as 'gai-bu' (two syllables) instead of 'ga-i-bu' (three moras).
Confusing the 'bu' sound with 'pu'.
Misplacing the pitch accent, making it sound like 'ga-I-bu'.
Elongating the 'i' sound too much.
Swapping the kanji order mentally with 'bugai'.

Difficulty Rating

Reading 2/5

The kanji are relatively simple (N4/N3 level), but the concept is introduced early.

Writing 3/5

The character '部' has many strokes and requires practice to balance correctly.

Speaking 2/5

Easy to pronounce, but requires knowing when to use it over 'soto'.

Listening 2/5

Clear sounds, but can be confused with other 'gai-' words if not careful.

What to Learn Next

Prerequisites

外 (soto) 部 (bu) 中 (naka) 人 (hito) 会社 (kaisha)

Learn Next

内部 (naibu) 委託 (itaku) 要因 (youin) 刺激 (shigeki) 監査 (kansa)

Advanced

外部不経済 (gaibu fukeizai) 外部性 (gaibusei) 部外者 (bugaisha) 社外 (shagai)

Grammar to Know

Noun + の + Noun

外部の専門家 (External expert)

Noun + から/に/を

外部から来る (To come from the outside)

Compound Noun formation

外部委託 (Gaibu + Itaku = Outsourcing)

Contrastive particle 'wa'

内部は良いが、外部は悪い (The inside is good, but the outside is bad)

Polite suffix 'kata'

外部の方 (A person from the outside - very polite)

Examples by Level

これは外部の箱です。

This is the outside box.

Uses 'no' to connect gaibu (outside) to hako (box).

外部の人はここに入れません。

People from the outside cannot enter here.

Gaibu no hito refers to people who are not part of the group.

外部は赤いです。

The outside is red.

Gaibu acts as the subject of the sentence.

外部にゴミを捨てないでください。

Please do not throw trash outside.

Gaibu ni indicates the location where the action happens.

外部の音を聞きます。

I hear outside sounds.

Gaibu no oto means sounds coming from the exterior.

このカメラは外部用です。

This camera is for external use.

Gaibu-you is a compound meaning 'for external use'.

外部から電話がありました。

There was a call from the outside.

Gaibu kara indicates the source of the call.

外部の空気を入れます。

I let in some outside air.

Gaibu no kuuki refers to the air from outdoors.

外部メモリを使います。

I use external memory.

Gaibu memori is a common technical term.

外部の専門家に相談します。

I will consult with an outside expert.

Gaibu no senmonka refers to a professional not employed by the company.

外部の光が眩しいです。

The outside light is bright.

Gaibu no hikari refers to the light from outdoors.

この建物は外部が古いです。

The outside of this building is old.

Gaibu highlights the exterior appearance.

外部のニュースをチェックします。

I check the outside news.

Gaibu no nyuusu refers to news from the world at large.

外部からの連絡を待ちます。

I am waiting for contact from the outside.

Gaibu kara no renraku means communication from an external source.

外部に漏らさないでください。

Please do not leak it to the outside.

Gaibu ni morasu is a common phrase for leaking secrets.

外部の刺激が必要です。

External stimulus is necessary.

Gaibu no shigeki refers to outside motivation or input.

外部委託することでコストを削減します。

We will reduce costs by outsourcing.

Gaibu itaku is the formal word for outsourcing.

外部講師によるセミナーを開催します。

We will hold a seminar with an external lecturer.

Gaibu koushi is a common term in education and business.

外部からの圧力が強まっています。

Pressure from the outside is increasing.

Gaibu kara no atsuryoku refers to social or political pressure.

外部の視点を取り入れることが重要です。

It is important to incorporate an outside perspective.

Gaibu no shiten refers to an objective viewpoint from an outsider.

外部ネットワークへの接続を確認してください。

Please check the connection to the external network.

Gaibu nettowaaku is used in IT contexts.

外部資金を調達する必要があります。

We need to raise external funds.

Gaibu shikin refers to capital from outside the company.

外部の環境が変化しています。

The external environment is changing.

Gaibu no kankyou can be physical or business-related.

外部スタッフと協力してプロジェクトを進めます。

We will advance the project in cooperation with external staff.

Gaibu sutaffu refers to freelancers or contractors.

外部要因が企業の業績に影響を与えました。

External factors influenced the company's performance.

Gaibu youin is a formal term for external causes.

外部監査を受ける準備をしています。

We are preparing for an external audit.

Gaibu kansa is an official inspection by an outside body.

外部記憶装置にデータをバックアップします。

I will back up the data to an external storage device.

Gaibu kioku souchi is the technical term for external storage.

外部とのコミュニケーションを円滑にします。

We will smooth out communication with the outside.

Gaibu to no komyunikeeshon refers to PR or external relations.

外部からの干渉を排除しなければなりません。

We must eliminate interference from the outside.

Gaibu kara no kanshou refers to unwanted meddling.

外部評価の結果を真摯に受け止めます。

We take the results of the external evaluation seriously.

Gaibu hyouka is an assessment by an outside third party.

外部設計のフェーズが完了しました。

The external design phase has been completed.

Gaibu sekkei refers to the design of parts visible to the user.

外部への情報発信を強化します。

We will strengthen our information dissemination to the outside.

Gaibu e no jouhou hasshin refers to public relations/marketing.

外部不経済の問題を解決するための政策が必要です。

Policies are needed to solve the problem of external diseconomies.

Gaibu fukeizai is a technical term in economics (negative externality).

システムの外部性を考慮に入れるべきです。

The externality of the system should be taken into account.

Gaibusei refers to the quality of being external or having external effects.

外部の権威に頼りすぎるのは危険です。

It is dangerous to rely too much on external authority.

Gaibu no ken'i refers to power structures outside oneself.

組織の外部境界を定義し直す必要があります。

It is necessary to redefine the external boundaries of the organization.

Gaibu kyoukai refers to the limit where the organization ends.

外部刺激に対する反応の閾値を測定します。

Measure the threshold of response to external stimuli.

Technical usage in psychology or physiology.

外部委託先との契約内容を精査します。

We will scrutinize the contract details with the outsourcee.

Gaibu itakusaki refers to the company receiving the outsourced work.

外部からの批判に対して、誠実に対応します。

We will respond sincerely to criticism from the outside.

Gaibu kara no hihan refers to public or media criticism.

外部環境の不確実性が高まっています。

Uncertainty in the external environment is increasing.

Gaibu kankyou in a strategic business context.

外部性の内部化を図ることが環境保護に繋がります。

Internalizing externalities leads to environmental protection.

Gaibusei no naibuka is a high-level economic concept.

自己と外部との峻別が困難な状態にあります。

It is in a state where distinguishing between self and the outside is difficult.

Shunbetsu means clear distinction; very formal and academic.

外部情報の恣意的な解釈が誤解を招きました。

Arbitrary interpretation of external information led to misunderstandings.

Shiiteki means arbitrary; high-level vocabulary.

外部リソースの最適化が喫緊の課題です。

Optimization of external resources is an urgent issue.

Kikkin no kadai means 'urgent issue'; very formal.

外部監査人の独立性が保たれています。

The independence of the external auditor is maintained.

Gaibu kansanin is a specific professional title.

外部宇宙への探査計画が進展しています。

Exploration plans for outer space are progressing.

Gaibu uchuu refers to space beyond our solar system or atmosphere.

外部の圧力に屈することなく、独自の道を歩みます。

Without yielding to external pressure, we will walk our own path.

Kussuru means to yield or surrender.

外部への依存度を低減させる戦略を策定します。

Formulate a strategy to reduce the degree of dependence on the outside.

Izon-do means 'degree of dependence'.

Synonyms

外側外部者他所アウェイ社外

Antonyms

内部内側中

Common Collocations

外部委託

外部メモリ

外部講師

外部要因

外部監査

外部刺激

外部からのアクセス

外部の視点

外部圧力

外部境界

Common Phrases

外部の人

— A person who is not part of the group or organization. Used to identify outsiders.

外部の人は立ち入り禁止です (Outsiders are forbidden to enter).

外部に漏らす

— To leak information to the outside world. Often used regarding secrets.

秘密を外部に漏らしてはいけない (You must not leak secrets to the outside).

外部との連絡

— Communication with parties outside of one's own group.

外部との連絡を絶つ (To cut off communication with the outside).

外部の意見

— An opinion from someone not involved in the situation directly.

外部の意見を聞くのは良いことです (It is good to hear outside opinions).

外部からの影響

— Influences originating from outside a system or person.

外部からの影響を最小限にする (To minimize influence from the outside).

外部の環境

— The surrounding conditions outside a specific entity.

外部の環境に適応する (To adapt to the external environment).

外部スタッフ

— Workers who are not permanent employees (contractors, etc.).

外部スタッフと協力する (To cooperate with external staff).

外部資金

— Money obtained from sources outside the organization (loans, investment).

外部資金を導入する (To introduce external funds).

外部の目

— The perspective of people looking in from the outside.

外部の目を気にする (To worry about how outsiders see you).

外部設計

— The part of a system design that interacts with the user.

外部設計を確認する (To check the external design).

Often Confused With

外部 vs 外 (soto)

Soto is for everyday life; gaibu is for professional boundaries.

外部 vs 外面 (gaimen)

Gaimen is the surface appearance; gaibu is the external area/entity.

外部 vs 屋外 (okugai)

Okugai is strictly physical 'outdoors'; gaibu can be social or conceptual.

Idioms & Expressions

"外部の血を入れる"

— To bring in new people from outside to revitalize an organization.

組織を活性化するために、外部の血を入れる (To bring in 'outside blood' to revitalize the organization).

Professional

"外部の風を入れる"

— To introduce new ideas or perspectives from outside a closed group.

古い習慣を変えるため、外部の風を入れる (To let in an 'outside breeze' to change old habits).

Neutral

"外部に目が向く"

— To start paying attention to things happening outside one's immediate circle.

最近、彼はようやく外部に目が向くようになった (Recently, he finally started looking toward the outside).

Neutral

"外部を遮断する"

— To completely cut off contact or influence from the outside world.

彼は外部を遮断して研究に没頭した (He cut off the outside world and immersed himself in research).

Formal

"外部の圧力がかかる"

— To feel forced to do something because of demands from outside parties.

政府から外部の圧力がかかった (External pressure was applied by the government).

Formal

"外部を固める"

— To strengthen the outer defenses or the external image of something.

まずは外部を固めることが先決だ (Strengthening the exterior is the first priority).

Professional

"外部に頼る"

— To depend on people or resources that are not internal to the group.

自力で解決できず、外部に頼った (Unable to solve it alone, they relied on the outside).

Neutral

"外部を装う"

— To pretend to be an outsider or to make something look like it came from outside.

犯人は外部の人間を装った (The criminal pretended to be an outsider).

Formal

"外部の評価を仰ぐ"

— To ask for an assessment from an objective third party.

新製品について外部の評価を仰ぐ (To seek an external evaluation of the new product).

Formal

"外部の力"

— Resources or power coming from beyond one's own capabilities or group.

外部の力を借りて成功した (Succeeded by borrowing power from the outside).

Neutral

Easily Confused

外部 vs 部外 (bugai)

They use the same kanji in reverse order.

Gaibu is the 'outside part' (general). Bugai is 'outside the department' (specific exclusion).

部外者は立ち入り禁止 (Outsiders/unauthorized people are forbidden).

外部 vs 社外 (shagai)

Both refer to things outside an organization.

Shagai is specifically for a 'company' (sha). Gaibu is a generic 'outside' for any group.

社外の打ち合わせ (Meeting outside the company).

外部 vs 郊外 (kougai)

Both start with 'gai' (outside).

Kougai specifically means 'suburbs' or 'outskirts' of a city.

郊外に住む (To live in the suburbs).

外部 vs 国外 (kokugai)

Both start with 'gai'.

Kokugai specifically means 'outside the country' (abroad).

国外追放 (Deportation).

外部 vs 例外 (reigai)

Both contain 'gai'.

Reigai means 'exception' (outside the rule), not a spatial outside.

例外はありません (There are no exceptions).

Sentence Patterns

[Object]の外部は[Adjective]です。

この箱の外部はきれいです。

外部の[Noun]を使います。

外部のメモリを使います。

外部に[Noun]を漏らさないでください。

外部に秘密を漏らさないでください。

外部要因によって[Result]しました。

外部要因によって失敗しました。

外部からの[Noun]を考慮に入れる。

外部からの批判を考慮に入れる。

外部の人は[Verb-nai]。

外部の人は入れません。

外部から[Noun]が来ます。

外部からお客さんが来ます。

外部委託を[Verb]。

外部委託を中止します。

Word Family

Nouns

外 (soto - outside)

部 (bu - part/section)

外部性 (gaibusei - externality)

部外者 (bugaisha - outsider)

Verbs

外れる (hazureru - to be disconnected/off)

外す (hazusu - to remove/take off)

Adjectives

外的な (gaiteki-na - external/outer)

内部 (naibu - internal)

中 (naka - inside)

表面 (hyoumen - surface)

環境 (kankyou - environment)

境界 (kyoukai - boundary)

How to Use It

frequency

Very common in news, business, and technical documentation.

Common Mistakes

Using 'gaibu' for going outside to play. → Soto de asobu.
Gaibu is too formal for daily activities like playing.
Saying 'gaibu hito'. → Gaibu no hito.
Gaibu is a noun and requires the particle 'no' to modify another noun.
Confusing 'gaibu' with 'gaikoku'. → Gaibu is 'external', Gaikoku is 'foreign country'.
They share a kanji but have different meanings.
Using 'gaibu' to mean the 'surface' of a fruit. → Kawa (skin) or gaimen (surface).
Gaibu refers to the area outside, not the skin itself.
Using 'gaibu' for 'everyone else' in a casual list. → Hoka no hito (other people).
Gaibu implies a strict organizational or physical boundary.

Tips

Using the 'no' particle

Always remember that 'gaibu' needs 'no' to describe a person or thing. 'Gaibu hito' is wrong; 'gaibu no hito' is correct.

Antonym Match

Learn 'gaibu' and 'naibu' together. They are a perfect pair for any formal description of 'outside' and 'inside'.

Uchi-Soto

Understanding 'gaibu' helps you understand the Japanese social boundary. It defines who is 'in' and who is 'out'.

Business Etiquette

In a Japanese office, use 'gaibu' to refer to consultants or contractors to maintain a professional distance.

IT Context

Look for 'gaibu' in your phone settings. It usually refers to SD cards or cloud storage (external storage).

Gaikokujin Link

Link 'gaibu' to 'gaikokujin'. Both start with 'gai' (outside). One is 'outside country person', the other is 'outside part'.

Kanji Strokes

The kanji for 'bu' (部) has 11 strokes. Practice the right-hand side (the 'o-zato' radical) carefully.

Pitch Accent

The word starts high and drops. GA-i-bu. Practicing this makes you sound much more native.

Context Clues

If you see 'gaibu' in a news headline, look for 'naibu' in the next sentence. They are often used to contrast theories.

N3 Prep

While used at A1 level, 'gaibu' is a key word for JLPT N3 and N2 reading passages. Master it early!

Memorize It

Mnemonic

Think of 'GAI' as 'GUY' and 'BU' as 'BOOT'. A 'GUY' is kicking a 'BOOT' to the 'OUTSIDE'.

Visual Association

Imagine a large circle representing a company. The word 'GAIBU' is written in big letters everywhere outside the circle.

Word Web

External Outside Outsider Exterior Business IT Boundary Foreign

Challenge

Try to find three items in your room and describe their 'gaibu' (exterior). Then, identify one person who is 'gaibu' to your family.

Word Origin

The word is a Sinitic compound (kango) formed from two Chinese characters. It entered the Japanese language through the adoption of the Chinese writing system and vocabulary during the early middle ages.

Original meaning: The original meaning in Chinese was 'the outside part' or 'external section,' which is identical to its modern Japanese usage.

Sino-Japanese (Kango).

Cultural Context

Be careful not to use 'gaibu no hito' for a guest you want to welcome warmly; instead, use 'kyaku-sama' (guest/customer). 'Gaibu' is objective and can feel a bit cold.

In English, 'outside' is used for both casual and formal contexts. In Japanese, 'gaibu' is strictly the formal/professional choice.

Commonly used in detective anime like 'Detective Conan' when discussing if a crime was committed by an outsider. Frequently seen in tech news regarding 'Gaibu Sutoreeji' (external storage) for gaming consoles. Used in corporate governance discussions in Japanese newspapers like the Nikkei.

Practice in Real Life

Real-World Contexts

Business Meetings

外部の意見 (outside opinion)
外部委託 (outsourcing)
外部スタッフ (external staff)
外部との提携 (partnership with outside parties)

Information Technology

外部メモリ (external memory)
外部接続 (external connection)
外部サーバー (external server)
外部攻撃 (external attack)

Academic Research

外部要因 (external factors)
外部刺激 (external stimulus)
外部環境 (external environment)
外部評価 (external evaluation)

Safety and Security

外部者の立ち入り (entry of outsiders)
外部への漏洩 (leak to the outside)
外部からの侵入 (intrusion from the outside)
外部遮断 (blocking the outside)

Everyday Formal Situations

外部の音 (outside noise)
外部の光 (outside light)
外部のデザイン (external design)
外部の方 (person from the outside - polite)

Conversation Starters

"外部の専門家に相談したほうがいいと思いますか？ (Do you think we should consult an outside expert?)"

"このプロジェクトに外部のスタッフは参加していますか？ (Are external staff participating in this project?)"

"外部の意見を取り入れるメリットは何でしょうか？ (What are the merits of incorporating outside opinions?)"

"外部メモリを持ってくるのを忘れました。 (I forgot to bring the external memory.)"

"外部からの圧力にどう対処すべきですか？ (How should we deal with pressure from the outside?)"

Journal Prompts

今日、外部の人と話して感じたことを書いてください。 (Write about how you felt talking to an outsider today.)

自分の生活に影響を与えている外部要因を３つ挙げてください。 (List three external factors affecting your life.)

「内部」と「外部」、どちらを重視すべきだと思いますか？ (Which do you think is more important, 'internal' or 'external'?)

外部の刺激が全くない環境で、あなたはどう過ごしますか？ (How would you spend time in an environment with no external stimulus?)

会社の外部評価を向上させるためのアイデアを書いてください。 (Write ideas to improve the external evaluation of your company.)

Frequently Asked Questions

10 questions

Not usually. For 'outdoors,' use 'soto' or 'okugai.' 'Gaibu' sounds like you're talking about the outside of a machine or an organization. For example, 'I'm playing outdoors' should be 'Soto de asondeiru,' not 'Gaibu de asondeiru.'

'Sotogawa' specifically means the 'outer side' or 'surface' of an object. 'Gaibu' is more general and can refer to the entire area or group of people outside. You'd use 'sotogawa' to describe the color of a box, but 'gaibu' to describe people who don't work at a company.

It is a formal and objective word. It's not 'polite' (teineigo) in itself, but it is appropriate for professional settings. To be polite to an outsider, you would use 'gaibu no kata' instead of 'gaibu no hito.'

Use 'shagai' when you want to specifically emphasize 'outside the company.' 'Gaibu' is more generic. If you are at work talking about a client, both work, but 'shagai' is very common for business-specific contexts like 'shagai-hi' (company secret).

No, for foreign countries, use 'gaikoku' or 'kokugai.' 'Gaibu' is for boundaries of objects or organizations, not national borders.

Yes, in medical or biological contexts, 'gaibu' can refer to the exterior of an organism or a cell, as opposed to the internal 'naibu.'

You say 'gaibu kara no eikyou.' This is a very common phrase in news and academic writing.

It means 'outsourcing.' It's when a company hires an external organization to do work instead of doing it internally.

Yes, especially in sci-fi or mystery anime where characters talk about 'gaibu kara no shinnyuusha' (intruders from the outside) or 'gaibu nettowaaku' (external networks).

No, it is a noun. To use it like an adjective, you must add 'no' (e.g., gaibu no hito) or form a compound (e.g., gaibu-memori).