Objectives: This study aimed to examine the effect of successful aging on depression and social capital(trust, norm, participation, network) of the elderly. Methods: Samples were obtained from 184 people aged over 65 years old in one county of Kyungsangbukdo. Data were analyzed with t-test, ANOVA and regression analysis. Results: First, depression, social capital and successful aging were significantly different by age, economic status and religion. Secondly, regression analysis showed that depression affected a negative influence on successful aging in Model 1, which analyzed only depression. However, Model 2, which analyzed depression and social capital at the same time, showed that only social capital affected successful aging. Conclusions: It was suggested to develop health promotion and social participation program are required for successful aging of the elderly.