This paper discusses the changes in the frequencies of induced abortions and births according to changes in the abortion legislation in Norway during the 1970s. The study material consists of women aged 15-44 years having undergone induced abortion or giving birth in seven Norwegian counties during the period 1972-83. Since the liberalization of the abortion legislation in 1976 and later when the law on abortion on women's request came into force in January 1979, the number of induced abortions per 1000 women 15-44 years of age has decreased by 20%, until December 31, 1983. For no age group has the number of induced abortions per 1000 women increased since the liberalization of the abortion legislation. While the number of terminations of pregnancy per 1000 women below the age of 25 has remained unchanged since 1975, the number of abortions per 1000 women aged 25-29 has decreased by nearly 18% and for women aged 30-44, by 34%. The number of terminated pregnancies per 1000 women of fertile age has shown a decrease corresponding to the reduction in births per 1000 women. Thus the liberalization of the abortion law cannot account for the decreased number of births after 1975.