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[Analysis of the fertility decline in Japan--focusing on the period of 1950-60 and 1975-85].

Marked fertility declines have been observed in Japan from 1950-60 and 1975-85. The dynamic structure of the fertility decline in the two periods was analyzed employing the Standardization Approach and Bongaarts Model of Proximate Determinants Analysis. The results indicate that the fertility decline in 1950-60 was mainly caused by a drop in marital fertility due to the expanding diffusion of contraception practices and increases in induced abortion. Increased age at marriage cannot be discounted as a factor also. The fertility decline in 1975-85 was mostly caused by delay of marriage as well as a reduction in proportion of the reproductive population which is composed of a cohort born in 1960 or later.