The purposes of the present study were to investigate the relationship among enervation, identity development, and family functioning, and to analyze their differences between male and female university students. Passivity Area Scale by Shimoyama (1995), Rasmussen's Ego Identity Scale for Japanese, and Family Adaptability and Cohesion Evaluation Scales III (FACES III) for Japanese were administered to 223 freshmen. The main results were the followings: (1) The enervation in the area of class was not related to identity development both in male and female students. (2) The enervation in the area of study as well as campus was related to whole stage of identity development in male students. On the other hand, in female students, the enervation in the area of study was hardly related to basic identity, and the enervation in the area of campus was related to identity based on relatedness. (3) The family functioning influenced the enervation in the area of study and campus through identity development in male students. On the other hand, in female students, the family functioning hardly influenced their enervation.