The transformation of population structure has been made progress in Japan. It caused serious problems to several political and economical conditions. And the next problem is the increase of single person. The late marriage and unmarried becomes popular in young generations. Each phenomenon causes the decrease of birth rate. And the rate of divorce is increasing. Therefore the diversification of family are proceeding. The aim of this paper is to clarify the regional differentiations of above mentions from the view point of population geography using Geographical Information System (GIS). Some interesting results on regional differentiation are founded. Firstly, the rate of single person's family increased 27.6 0n 2000 from 19.8-1073749200n 1980. The distribution of younger single persons shows concen-tration in metropolitan regions. Elder single distributes both in the core of metropolitan regions and in rural regions. Secondly, the rate of unmarried people are increasing in 25-29 age and 30-34 age groups. Its rate shows higher in the metropolitan regions than rural regions. Its regional differentiation is the widest in 25-34 age groups. Third, the rate of divorced people are increasing. Its distribution shows complexities. High rate distributes in many rural regions; Hokkaido, Tohoku, Shikoku, Kyusyu and Okinawa.