The purpose of this study is to investigate the relation between distress tolerance, flexibility and counter-transference utilization of music therapists and to verify the mediating effects of individual flexibility and coping flexibility in the effect of the distress tolerance on counter-transference utilization. For this study, the distress tolerance, flexibility, counter- transference utilization levels and general nature were measured targeting 169 music therapists over master’s degree who majored in music therapy. The result of study is as follows. First, as a result of verifying the difference of the counter-transference utilization level following the general nature of the music therapists, a significant difference was shown in the level of counter-transference utilization according to the highest level of education, main therapeutic target and psychological counseling or therapy-experience or not. Second, distress tolerance, individual flexibility and coping flexibility showed a significant positive correlation and effect. Also, individual flexibility, coping flexibility and counter-transference utilization had a significant positive correlation and effect. Third, each of individual flexibility and coping flexibility mediated the relation between distress tolerance and counter-transference utilization. Also, individual flexibility and coping flexibility partially mediated through this path: [distress tolerance → individual flexibility → coping flexibility → counter-transference utilization]. Through this, it is reasoned that the higher distress tolerance, the more flexible in coping and in cognitive or interpersonal relation, it will be connected to proper counter-transference utilization, even if it does not directly affect counter-transference utilization. Therefore, these findings suggest that music therapists who are in the stress situation of counter-transference phenomenon could minimize the negative affect of counter-transference and utilize counter-transference as an effective therapeutic tool thereby being tolerant, flexible in coping.