The total fertility rate in South Korea is at its lowest in the world, and there is a sense of crisis about this. One of factors influencing the total fertility rate of women is their postpartum depression, which is correlated with their pregnancy experience. In this study, we aimed to investigate correlation between positive or negative pregnancy experience, maternal attachment, and postpartum depression among who have given birth, The design of this study is descriptive correlational research, and the participants included 152 women undergoing postpartum care in postpartum care centers located in Seoul and Gimhae city. The average age of the participants in this study was 33.72 years, and their mean scores for pregnancy experience indicated that positive scores were higher than negative scores. Also, the research results revealed that there is a significant correlation between women`s positive or negative pregnancy experience and postpartum depression. Based on the findings of this study, it is necessary to provide proactive intervention and support from the time of pregnancy to enhance the well-being of postpartum women.