In minimum housing standard which has been established by the Ministry of Construction, the criteria for necessary area space of dwelling rooms per household are set up. The purpose of this paper is to clear up differences between the criteria and the practical way of dwelling of house-holds in public housing. We examined original data of public housing in Fukuoka prefecture (1980). The results provide evidence that the size of a bed-room for two or more persons in smaller than the criteria's. This means that households use the largest rooms for living-rooms, dining-rooms, etc. not for bed-rooms.
