Purpose: The purpose of this study was to determine the effects of music therapy on postpartum blues and maternal attachment of puerperal women. Methods: The research design was a nonequivalent control group non-synchronized design. The participants were puerperal women who agreed to participate in this study and through a convenience sampling, 60 puerperal women were recruited (30 in the experimental group, 30 in the control group). After measuring postpartum blues and maternal attachment, music therapy was provided to the experimental group over 40 min, once a day, and for 8 days. Then, postpartum blues and maternal attachment for the experimental and control group were measured again on the 8th day. The data were analyzed using the SPSS WIN 12.0 Program. Results: The first hypothesis that "the degree of postpartum blues for the experimental group who participated in music therapy would be lower than that of the control group" was accepted (t=4.350, p<.001). The second hypothesis that "the degree of maternal attachment of the experimental group who participated in music therapy would be higher than that of the control group" was accepted (t=4.828, p<.001). Conclusion: These findings indicate that music therapy has positive influences on decreasing postpartum blues and increasing maternal attachment of puerperal women.