The first purpose of the study was to examine the mediating effect of psychological contract breach in the relationship between role stress(role ambiguity, role conflict, and role overload) and organizational commitment. The second purpose of this study was to examine the moderating effect of resilience in the relationship between role stress(role ambiguity, role conflict, and role overload) and psychological contract breach. For these purposes, data were collected from 267 employees working in various corporations by questionnaires. Results indicated that role ambiguity, role conflict, and role overload have positive effects on psychological contract breach, and that psychological contract breach has a negative effect on organizational commitment. The psychological contract breach partially mediated the relationship between role ambiguity and organizational commitment, and fully mediated the relationship between role conflict and role overload and organizational commitment. The moderation effect of resilience was found because resilience weakens the positive relationship between role overload and psychological contract breach. Based on these results, academic and practical implications were discussed. Finally, the limitations of this study and directions for the future research were discussed.