The aim of this study was to better understand the factors of the mentoring function in the foodservice industry that improve the organizational commitment of subordinates, and to asses the roles that trust towards supervisors play in the relationship between the mentoring and organizational commitment. A survey was of subordinates who were conducting the mentoring in foodservice companies (hotels, family restaurants) located in Seoul and Gyeonggi area was conducted from May 1 to May 30, 2008. The questionnaires were distributed to 400 employees in 50 restaurants and, 341 of them were received and a total of 320 were finally analyzed. The results were as follows. First, the effect of mentoring functions on the organizational commitment of subordinates indicated that the career developing function and psychosocial function had a significant positive effect on the emotional commitment and normative commitment (p<.01), and the career developing function, psychosocial function and role modeling function had a significant positive effect on the enduring commitment (p<.01). Second, the mediating roles of supervisory trust in the relationship between mentoring functions and organizational commitment of subordinates indicated that supervisory trust mediated the relationship between the career developing function of the mentoring functions, and enduring commitment and normative commitment in addition, it met the mediating requirements in terms of the relationship between the role modeling function, and the emotional commitment, enduring commitment and normative commitment. Consequently, the high career developing function, psychosocial function and role modeling function in mentoring raised the level of organizational commitment;thus, the mentoring system should used as on of the mentoring functions in the foodservice industry and mentoring functions should be also established.