Future Japanese population estimated by the Research Institute for Population Problems, will be 100, 000, 000 at 1970-75, and 20, 000, 000 peoples will want new employments. This number cannot be checked with birth control or other methods of restriction. Our village population is too crowded as to its cultivated fields, therefore the percentage of agricultural and forestry population shall be decreased to less than 48% (including fishing) of 1950 census. Cities will share more than the rate of national increase. It is the metropolitan districts that be able to absorb population from the viewpoint of industrial location, but their residential accomodations, transportation facilities, and etc. are poor, so overcrowding of population in great cities will be earlier revealed than the national one. A solution is to develop satellite cities in metropolitan districts, and the second is to aid the growth of great cities out of the metropolitan districts-Toyko-Yokohama, Osaka-Kobe, Nagoya, and Northern Kyushu. The third is the strong support for the development of local small and middle cities which have direct and intimate relationships with rural districts.
As an example, Nanao city, Ishikawa Prefecture, has been researched, with the result that its area of population supply is small and centripetal force is weak. Much kinds of seasonal migration of population such as “Toji” (sake brewer), fishing, labour in public bath house, and etc. have been originated in the poorness of villages especially in such an area of Hokuriku District, difficult to get works in winter, but also in the lack of adequate urban centers to digest population flow from surrounding rural area.