The purpose of this study is to review the relationship between CEO's transformational leadership and performance, and the mediating effect of corporate entrepreneurship in entrepreneurs’cooperative. In order to verify and achieve the purposes mentioned above, questionnaire data were gathered and analysed from 379 employees of entrepreneurs’cooperative in Kangwon-do province. Empirical survey's findings are as follows; First, charisma and individual consideration appeared to be positively related with risk-taking and proactiveness. Also, intellectual stimulation appeared to be positively related with proactiveness only. Second, charisma and individual consideration appeared to be positively related with sales volume and employment increase, but intellectual stimulation appeared to be positively related with employment increase only. Third, corporate entrepreneurship(risk-taking, proactiveness) appeared to be positively related with sales volume and employment increase. Fourth, corporate entrepreneurship(risk-taking, proactiveness) had mediating effect on the relationship between CEO's transformational leadership and performance. But, intellectual stimulation had not mediating effect