Meaning
The kanji 部 (bu) is a versatile and essential character in Japanese. It means things like "part," "section," "department," "club," "group," or even "a copy (of a book)." This breadth of meaning is key to understanding organizational structures, divisions of a whole, and social groupings.
Its etymology reveals that 部 is a phono-semantic compound (形声文字 - keisei moji). The left component, ⺕ (わかんむり), is an archaic form suggesting 'division' or 'marking off.' The right component, 阝 (おおざと), comes from 邑 (むら), meaning 'village,' 'town,' or 'administrative district.'
We can imagine the left component indicating division or segmentation. The right component then places this division within a larger geographical or administrative entity, like a village or district. This visual combination represents the idea of a 'section' or 'part' designated within a broader area or organization.
This visual connection directly reflects its core meanings: a department is a section of a company, and a club is a group as part of a school. A 'part' itself is a division of a larger whole. Even referring to a "copy" of a book (一部) is seen as one unit from a production run.
The kanji 部 consists of 11 strokes and is taught in the 3rd grade of Japanese elementary school (小学3年生).
Readings
In modern Japanese, the kanji 部 is primarily read using its On'yomi, especially from the JLPT N3 level upwards. It appears almost exclusively in compound words. While a historical Kun'yomi exists, it's rarely used today as a standalone word.
On'yomi (音読み) — Chinese-derived readings
The main On'yomi for 部 is ブ (BU). This reading is very common and essential for many everyday words that denote divisions, departments, or groups. Derived from Chinese, it's always used when 部 appears in compound words.
全部 (zenbu) — all, the whole, entire
学部 (gakubu) — faculty, department (e.g., at a university)
部長 (buchō) — department head, manager
部屋 (heya) — room (Here, '部' still hints at a 'section' of a dwelling, combined with '屋' for dwelling/house.)
一部 (ichibu) — a part, one portion; one copy (of a document or book)
運動部 (undōbu) — sports club (e.g., at a school)
Kun'yomi (訓読み) — Native Japanese readings
Unlike many other kanji, 部 doesn't have a commonly used Kun'yomi in modern Japanese. While historical or archaic uses might link it to forms like -べ (-be) (usually as a suffix or in specific contexts), this reading isn't actively used for 部 on its own. Japanese learners, especially at the N3 level, will rarely encounter it. For practical purposes, prioritize its On'yomi and its role in compounds.
- No common standalone Kun'yomi, though -べ can appear as a rare suffix or in historical compounds.
Common Words & Compounds
The kanji 部 is highly versatile in forming compound words, covering everything from organizational structures to parts of a whole and various groups. Mastering its usage hinges on understanding these compounds.
Organizational Divisions & Roles
部署 (busho) — post, one's station; department (within a company)
営業部 (eigyōbu) — sales department
人事部 (jinjibu) — human resources department
編集部 (henshūbu) — editorial department
経理部 (keiribu) — accounting department
本部長 (honbuchō) — general manager, head of headquarters
Clubs & Groups
文化部 (bunkabu) — cultural club (e.g., in a school)
美術部 (bijutsubu) — art club
写真部 (shashinbu) — photography club
クラブ活動 (kurabu katsudō) — club activities (often uses 部 implicitly)
Parts & Sections of a Whole
大部分 (daibubun) — majority, most part
下部 (kabu) — lower part, subordinate (e.g., lower part of a structure)
上部 (jōbu) — upper part, top
各部 (kakubu) — each part, various sections
身体の一部 (shintai no ichibu) — a part of the body
Copies & Editions
二部 (nibu) — two copies (e.g., of a document)
全三部 (zensanbu) — all three volumes/parts (e.g., of a series)
Example Sentences
この本は三部作の一部です。
Kono hon wa sanbusaku no ichibu desu.
This book is one part of a trilogy.
彼は会社の営業部で働いています。
Kare wa kaisha no eigyōbu de hataraiteimasu.
He works in the company's sales department.
私は高校時代にテニス部に入っていました。
Watashi wa kōkō-jidai ni tenisu-bu ni haitte imashita.
I was in the tennis club during my high school days.
この報告書を二部コピーして、一部は部長に渡してください。
Kono hōkokusho o nibu kopī shite, ichibu wa buchō ni watashite kudasai.
Please copy this report twice, and give one copy to the department head.
会議には会社の大部分の社員が出席しました。
Kaigi ni wa kaisha no daibubun no shain ga shusseki shimashita.
The majority of the company's employees attended the meeting.
部長は新しいプロジェクトの詳細を全体会議で説明しました。
Buchō wa atarashii purojekuto no shōsai o zentai kaigi de setsumei shimashita.
The department head explained the details of the new project at the general meeting.
日本の学校には多種多様な運動部や文化部があります。
Nihon no gakkō ni wa tashutayō na undōbu ya bunkabu ga arimasu.
Japanese schools have a wide variety of sports clubs and cultural clubs.
製品の下部に重要な注意書が書いてありますので、ご確認ください。
Seihin no kabu ni jūyō na chūigaki ga kaite arimasu node, go-kakunin kudasai.
Important instructions are written on the lower part of the product, so please check them.
私たちの会社は全部門が協力してこのプロジェクトに取り組んでいます。
Watashitachi no kaisha wa zenbumon ga kyōryoku shite kono purojekuto ni torikundeimasu.
All departments in our company are cooperating on this project.
Memory Tip
To help remember 部, visualize its components: the right side, 阝 (おおざと), is the "village" or "town" radical. The left side, ⺕, represents a division or section.
Imagine a village (阝) being divided into various sections or "departments" (⺕) for administrative purposes, like a sales or accounting department. Alternatively, picture a large book where each "part" (部) is clearly "marked off" (⺕) from the others, similar to chapters in a novel's section. This visual of dividing a larger entity into smaller, distinct parts should help you remember its core meanings: 'part,' 'section,' and 'department.'