The purpose of this study was to clarify the psychological traits of juvenile delinquents, from the relationship between two ideal images (social ideal and personal ideal) and two self images (possible and real). In this study, developmental viewpoint and the relationships among four images were given special importance. 113 juvenile delinquents and 438 high shcool and college students (from 16 to 19 years, meles only) responded to a SD scale containing 17 items of four concepts respectively, and a self-esteem scale containing 10 items. The result showed that the delinquents marked low score in (strength and seriousness) factors of social ideal image, and high scores in (strength, tenderness and extroversion) factors of real-self image. This result suggested juvenile delinquents had a self-megalomanic tendency and a weak normative sense. From the profiles of ideal images and the low correlation between the ideal-real self discrepancy and the self-esteem score, it was clarified that young juvenile delinquents had undifferentiated ideal images and their internalization of social and personal ideal was weak, compared with a control group.