In this study, we investigated the relationship between attachment to parents, dependency on someone other than parents, and independence in adolescence. The subjects were 246 undergraduate students (110 males, 131 females, and 5 unknown). Participants who answered that their dependency was on someone other than their parents were 150 (77 males, 69 females, and 4 unknown). The hierarchical multiple regression analysis indicated that the dependency on someone other than their parents affects independence. In particular, dependency on someone other than parents has a buffering effect between attachment to parents and collaborative interpersonal relationships. Our results suggest that adolescents who have unstable attachments to their parents can be adaptive in their development, if they can request psychological support or obtain a stable and secure dependency object.