I carried out this research, targeting 201 pairs of middle-aged mothers and their adolescent children who reside in Busan and it aims to consider how mother’s separation anxiety through overprotection affects psychological adaption of parents themselves. It also aims to consider how mother’s overprotection makes their children separate themselves psychologically from their parents and how it affects children’s psychological adaption. In addition, this research aims to consider if there’s any disjunction between overprotection reported by mothers and the one perceived by their children. I can summarize the result as follows. First, the result of a regression analysis on the relationships between mother’s separation anxiety and overprotection as well as psychological adaption was that mother’s separation anxiety affected her overprotective rearing attitude. In addition, the study revealed that the stronger mother’s separation anxiety and overprotection are, the lower subjective and psychological well-being -positive indices of psychological adaption- are, in contrast, the higher depression -one of the negative indices- is. Second, the result of a regression analysis on the relationships between overprotection perceived by children and separation-individuation as well as the psychological adaptation was that overprotection perceived by children affected separation-individuation. When the index of perceived overprotection was high and when a child didn’t achieve healthy separation-individuation, positive indices of subjective and psychological well-being was low, in contrast, negative index of depression was high. In addition, there was a disjunction between the overprotection reported by mothers and the one perceived by children. Among the 201 pairs mentioned above, overprotection reported by mothers was higher than the one perceived by their adolescent children in 147 pairs. For other 9 pairs, there was no disjunction between overprotection reported by mothers and the one perceived by adolescent children. And as for the rest of 45 pairs, overprotection perceived by adolescent children was higher than the one reported by their mothers. In its final analysis, if a middle-aged mother has separation anxiety towards her adolescent child, it has a negative effect on the psychological adaption of the mother herself and, in turn, the effect perceived by her child has a negative effect on the psychological adaption of the child as well. Finally, implications, limitations, and suggestions of the present study were discussed.