JOMM is Japan's largest museum dedicated to Japan's overseas emigration history and experience.

It is operated by the Japan International Cooperation Agency (JICA) which is Japan's Peace Corps. There are permanent exhibitions explaining the immigration to Hawai’i, continental USA, and other countries especially South America. There are also changing or special exhibitions. The museum also has a reference library (closed on Sun.) with a collection of 20,000 books and materials about Japan's immigration.