Bachelor, Keio University, 1950. Doctor of Philosophy, Keio University, 1966.
Professor, Keio U., Tokyo, 1967-1989; professor, International Research Center for Japanese Studies, Kyoto, 1989-1995; professor, Reitaku U., Kashiwa, Japan, since 1995.
President Socio-Economic History Society, Tokyo, 1991-1994. Vice president International Association Economics History, Paris, since 1994, International Committee of History Demography, Paris, since 1990.
Married Hiroko Takada, June 19, 1956. Children: Arito, Chizuru.