Healthcare organizations need mutual cooperation among various medical professionals in order to carry out the performance of their duties spite of haying a strong job specialization and independence based on license. However, spite of the importance of leadership roles, there have not been enough researches dealt with leadership effect under the complex duties' relationship of a healthcare organization. This study suggested a new model by combining characteristics of leadership style, job satisfaction, and organizational commitment using Structural Equation Model (SEM). The data were self-administered questionnaires collected in 2006 from 437 employees (nurses, medical technicians, and administrative staffs) of 5 hospitals located in Seoul. The items of questionnaire were composed as a method of choosing new leadership style based on the Bass's standardized questionnaire on a Iransactionaljtransformational leadership combining the Leader Behavior Description Questionnaire-XII (LBDQ-XII) of the Ohio State University and Graen and Uhl-Bien's LMK scale through simulation techniques responding to organizational commitment. As a result, the leadership style increasing employees' self-confidence and having continuous response relationship between managers and employees improved their discretion and empowerment as well as worthwhileness and pride. However, the leadership style emphasizing reward and a sense of duty brought about a bed result that was not able to effectively respond to employees' discretion and empowerment and even weakened their worthwhileness and pride. After all, the leadership style based on vision and change had an effect on organizational commitment but the other one based on reward and a sense of duty seemed to be unsuccessful in organizational commitment. Therefore, the desirable leadership in a healthcare organization should be based on employees' self-confidence and continuous response relationship between managers and employees.