In the present study, we elucidated the association between mother-daughter relationships and the identities of daughters during adolescence. We also determined the differences in the identities of daughters who lived with their mothers and those who lived separately. Using a mother-daughter relationship scale and an identity scale, we surveyed 112 female college students. We performed a factor analysis of the mother-daughter relationship scale and extracted two factors, i.e., codependency and bonding. We found a negative correlation between the identity score and the codependency factor score of the mother-daughter relationship; we also found a positive correlation between the identity score and the bonding factor. Furthermore, daughters who lived separately had higher identity scores than daughters who lived with their mothers. However, evidence suggested that this difference was not because of the mother-daughter relationship.