This study was conducted in order to find out protective factors on adolescent’s social withdrawal. The purpose of this study was to test the mediator effects of adolescent’s ego-resilience in the relation between affectionate parenting attitudes and adolescent’s social withdrawal. The data were collected from 586 students of high schools located in ‘D’ city, Korea. Adolescents completed questionnaires on ‘My Memories of Upbringing(EMBU-short)’, ego-resilience, and ‘Korean Youth Self Report(K-YSR)’ scales. The correlation and structural equation model were conducted to examine the relations between the variables by using the SPSS 21.0 and AMOS 21.0. The results are as follow: First, while the affectionate parenting attitudes did not directly affect the adolescent’s social withdrawal, the ego-resilience had a direct effect on the adolescent’s social withdrawal. Second, there was a significant mediator effect of the adolescent’s ego-resilience between the affectionate parenting attitude and adolescent’s social withdrawal. In conclusion, these results can be used as basic data to prevent social withdrawal of adolescents and increase their ego-resilience.