The purpose of this study is to test the covariance structural models that include the effects of legitimacy, and stability of women on gender social identity, and gender equality. In order to test the fitness of this model and each detailed path, covariance structure analysis was performed using the data collected from 332 female. The results revealed that this model was well-fitted to the data. Among the specific examinations of the relationship, most of the hypotheses were confirmed; along with the increase of the effect of legitimacy, group commitment increased. And along with the increase of the group commitment, gender equality increased, too. This result shows usability of social identity theory in male-female intergroup relationship and differentiation of factors of gender social identity. The significance, implications, and limitations of these findings were discussed and topics to be investigated in the future study were mentioned.