A large amount of literature has addressed the relationship between women’s employment and fertility in the Western context. We have less relevant knowledge about the context of East Asia. This thesis addresses this situation by providing insight into how women’s employment is interrelated with their fertility in South Korea. I investigate women’s life-course transitions to motherhood, labor force return after childbearing, and second childbearing, respectively. Data used for my analyses come from the Korea Labor and Income Panel Study (KLIPS). My studies show that the traditional practice of leaving the labor market at an early stage of family life has gradually been replaced by a pattern of staying at work until and during pregnancy. Among wage earners, women with stable employment positions are more likely than others to become a mother. Further, women with a good labor market standing are more likely to return to the labor force immediately after childbirth without any career interruption. Still, a considerable number of women shift to homemaking after childbirth. The outbreak of the Asian financial crisis in 1997 pushed mothers to hold tighter to the labor market than before. Labor force participation after first birth depresses women’s likelihood of having a second child.