Since the term "socialization" was defined, numerous researchers have studied its content and function in many fields of research: i. e., sociology, social psychology, etc. Socialization is, in this sense, an interdisciplinary topic which contains subnotions that are peculiar to each field of study. In the field of organizational behavior, that is called "organizational socialization." The purpose of this study is to review the theories of organizational socialization critically and reconsider the characteristics of organizational socialization theoretically. The areas covered by this review are: (1) the comprehensive concept of socialization with organizational socialization as a subnotion, (2) a critical review of past research, and (3) the two major perspedives adopted in past research. This research has two major conclusions about (a) the difference in the perspectives of organizational socialization between the career development field and organizational behavior field, and (b) the insufficiency of empirical research approaches that focus on the "stage-model" and individual mechanisms which facilitate attitude change.