Participants come from the countries in Asia and the Pacific region.
The headquarter in Tokyo is responsible for the research and the organization of all levels of training courses for the public prosecutors and assistant public prosecutors, and the higher leveled or specialized training courses for the public prosecutor's assistant officers, staff members in the Legal Affairs Bureaus, probation officers and immigration inspectors. The eight branch offices provide the first training course for newly appointed officials and middle leveled courses for the middle class officials. Under the current financial and administrative reforms of the government, every agency of the government is strongly urged to promote rationalized and effective conduct in their administrative services on the one hand, and to catch up with generational changes now developing in the composition of staff members on the other. In the light of such a situation, the Institute is now working on the reappraisal of the existing outline of training programs, and has made some of them more effective and service oriented.