The purpose of this study verifies: the relationships between trust in supervisor and innovative behavior, and mediator effect of the organizational commitment(affective commitment, continuance commitment). In order to verify the relationships and mediator effect, data obtained from 140 employees working in business office in Ulsan Metropolitan City and they were analyzed by using SPSS 12.0. The findings are as follows: First, the relationship between trust in supervisor and the organizational commitment(affective commitment, continuance commitment) is positively related. Second, there was also a positive correlation between affective commitment and innovative behavior. Finally, affective commitment played as a partial mediator on the relationship between trust in supervisor and innovative behavior. However, there was no empirical evidence for the mediating effect of continuance commitment on the relationship between trust in supervisor and innovative behavior. Based on these findings, the implications and the limitations of the study were presented including some directions for future studies.