The purpose of this study is to closely examine the factors affecting the organizational commitment of Public librarians. To do this, I have classified the factors related to organizational commitment into personal circumstantial factor. role factor, job factor, and organizational climate : and tried to explain the difference in organizational commitment according to each specific factor and which factor most heavily affected the organizational commitment. To do this I have conducted document studies and surveys. As the result of the study I have analyzed that the job factor effect the organizational commitment of public librarians the most among the four factors; personal circumstantial factor, role factor, job factor. and organizational climate. In succession. organizational climate, personal circumstantial factor was next in line. And the role factor was analyzed as the factor that least affected the organizational commitment of public librarians.