都道府県別にみた老年人口指数の経年変化について

抄録

Changes in ratio of aged population 65 and over to adults aged 15-64 -hereafter reffered to as “index”- in Japan were followed-up from 1920 to 1970. In the process of rapid population change, differences among prefectures in this index became clear in such a fact that Hokkaido and Tohoku districts have relatively lower value than Sanin and a part of Shikoku districts. This fact has continued up to present . It is natural that the change of this index is mainly affected by the interpref ectural migration of working ages, but we can also see the relation between this index and death rates of old age untill 1955. This relation may suggest that large differences in death rates of old age among prefectures were found till that time . Then, we will have to obtain detailed data about the population composition in pre-census days, say Meiji and Edo era, in order to understand the causes or factors of regional differences shown by this index.