White paper on crime 2012 Part2/Chapter4
There are three types of penal institutions, namely prisons, juvenile prisons, and detention houses. Prisons and juvenile prisons are mainly used to hold sentenced inmates while detention houses are mainly used to hold inmates awaiting judgment. Workhouses where offenders who are unable to pay fine or petty fine get detained, and, court-ordered confinement houses where persons subject to court-ordered confinement, as provided in Article 2 of the Act on Maintenance of Order in Courtrooms, etc. (Act No. 286 of 1952), get detained, are attached to penal institutions, although excluding some institutions. As of April 1, 2012, there were 77 main penal institutions (62 prisons that include four rehabilitation program centers, seven juvenile prisons, and eight detention houses) and 111 branch penal institutions (eight branch prisons and 103 branch detention houses).
Female adults placed under guidance dispositions for committing the offenses stipulated in Article 5 of the Anti-Prostitution Act (illegal solicitation, etc.) are held in women’s guidance home. At present there is one women’s guidance home in Tokyo, with only one female admitted in 2005 over the last 10 years and then another in 2011 (Source: Annual Report of Statistics on Correction).