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How to become a Public Prosecutors Office Assistant Officer

Assists public prosecutors or works under their direction on the whole criminal process, from investigating crimes to court proceedings and carrying out sentences, and also handles general affairs, personnel and accounts.

Workers in this job say university, high school, or vocational college (senmon gakko) is common. From job tag's survey of people in each job, who could give several answers. It shows what workers see as common, not how many workers hold each level.

How to become one

These officers are national public servants in the Public Prosecutors Office, a special body of the Ministry of Justice. You sit the National Personnel Authority's general national public service exam (university graduate level or high school graduate level), and from those who pass, you are hired as a prosecutor's assistant officer after an interview with a district public prosecutors office. Training takes place at the Research and Training Institute of the Ministry of Justice and its branches at 8 locations around the country. Following a carefully planned curriculum to develop prosecution specialists, prosecutors and others teach practical courses. These include an introductory course for new staff to learn the basic knowledge and skills needed in a prosecutors office, an intermediate course for mid-career staff to learn what they need as prosecutors' partners and improve their investigation and trial skills, and an advanced course to gain specialist knowledge and skills and a high level of practical ability. Officers are placed in investigation and trial sections, prosecution affairs sections and secretariat sections, gain varied experience by moving between them, and are promoted to higher posts such as investigator, specialist officer and section manager. After meeting certain eligibility requirements, you can also become an assistant prosecutor or a prosecutor by passing an exam.

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How do I become a Public Prosecutors Office Assistant Officer?

These officers are national public servants in the Public Prosecutors Office, a special body of the Ministry of Justice. You sit the National Personnel Authority's general national public service exam (university graduate level or high school graduate level), and from those who pass, you are hired as a prosecutor's assistant officer after an interview with a district public prosecutors office. Training takes place at the Research and Training Institute of the Ministry of Justice and its branches at 8 locations around the country. Following a carefully planned curriculum to develop prosecution specialists, prosecutors and others teach practical courses. These include an introductory course for new staff to learn the basic knowledge and skills needed in a prosecutors office, an intermediate course for mid-career staff to learn what they need as prosecutors' partners and improve their investigation and trial skills, and an advanced course to gain specialist knowledge and skills and a high level of practical ability. Officers are placed in investigation and trial sections, prosecution affairs sections and secretariat sections, gain varied experience by moving between them, and are promoted to higher posts such as investigator, specialist officer and section manager. After meeting certain eligibility requirements, you can also become an assistant prosecutor or a prosecutor by passing an exam.

Do you need a degree to become a Public Prosecutors Office Assistant Officer?

Usually. In this job's census occupation group, 69% of workers are university graduates.

Will AI change the work of a Public Prosecutors Office Assistant Officer?

Generative AI could change some tasks in this job, by the ILO's global estimate.

Sources

独立行政法人労働政策研究・研修機構（JILPT）作成 職業情報データベース 解説系ダウンロードデータ（IPD_DL_description_7_01.xlsx）ver.7.01 職業情報提供サイト（job tag）より2026年10月4日にダウンロード（https://shigoto.mhlw.go.jp/User/download）を加工して作成

独立行政法人労働政策研究・研修機構（JILPT）作成 職業情報データベース 簡易版数値系ダウンロードデータ（IPD_DL_numeric_7_00.xlsx）ver.7.00 職業情報提供サイト（job tag）より2026年10月4日にダウンロード（https://shigoto.mhlw.go.jp/User/download）を加工して作成

Sources: JILPT Occupational Information Database download data via job tag (解説系 ver.7.01 and 簡易版数値系 ver.7.00, downloaded 4 October 2026), processed by Peernovo; MHLW, Basic Survey on Wage Structure 2025; Statistics Bureau of Japan, 2020 Population Census; MEXT, School Basic Survey 2025; MHLW, Employment Referrals for General Workers (Hello Work statistics). Figures processed by Peernovo. English job names, translations and the matching of jobs to statistical groups, schools and degree fields by Peernovo.

Updated 4 October 2026