Sorachi Area in Hokkaido, public housings rebuilt of coal mine workers houses are located outside of urban area and many houses are unoccupied. But Chikuho Area in Fukuoka prefecture, many coal mine workers houses and public housings are located inside of urban area. Authors proposed that in Sorachi Area many public housings have to be rebuilt and replaced into the urban area. In Chikuho Area, those wooden housing estates developed for coal mine workers have to be improved to public housings and developed open spaces for neighborhoods.
