The purpose of the present study was to investigate the relationship between identity development and commitment to significant others. Data were obtained on the base of questionnaire distributed to 193 university students. The questionnaire was consisted of 12 items to measure identity development and 24 items to access the developmental level to relate others in the conflict situations. The main results were the followings : 1) The developmental level of identity and commitment to others had statistically significant correction. 2) Women's level of commitment to others was significantly higher than that of men. These results suggested that commitment to others had a important role for identity development in adolescence.