The purpose is to explore the mentality differences between the delinquents and non-delinquents by sixty-item questionnaire. Subjects were 41 delinquents in the reformatory and 86 high school boys. In the first analysis, principal factar and geomax rotation were applied to these items, which yielded sociability, self-esteem, and will-power factors. ANOVA of scores on these three factors classified two groups well. In the second analysis, oblique geomax rotation as applied to the two groups separately. The data of delinquents yielded five factors, characterized by problem behavior and timidness, while the data of non-delinquents yielded three factors. The similarity of structure between the two was low, when the best matching solutions were considered as criteria.
