Fuchu Prison is the largest prison in Japan and contains both Japanese and foreign prisoners. The Japanese prisoners are male offenders 26 years old or over with prison terms of less than 8 years, who have past prison records, lack the desire for rehabilitation, and are difficult to treat. Many of the inmates are members of criminal organizations, substance abusers or vagrants. They are often more repeat offenders rather than truly dangerous criminals.
Most foreign men convicted in Japan are held at Fuchu Prison. The number of foreign inmates is increasing yearly, and at present, more than 500 foreigners representing over 40 nationalities are found in the foreign inmate population.