In this study on the change of juvenile delinquencies after WWII, the auther picked up “Inpudence” (ZOCHO) as a key cancept for understanding juvenile delinquents prevailing in the recent years.

Juvenile delinquencies of the classic type, resulting from poverty and social disorder, were predominant in the post war period, followed by delinquencies committed by dropped-outs in the afluent society, delinquencies as a play, and delinquencies for enjoyment. Dependency was focused on as a major personality characteristics in this second wave of juvenile delinquencies. A third type of delinquencies have heen increasing in number since around 1977, shortly after the first oil crisis. In auther’s view an increasing number of juveniles tend to show ego-inflation, reberious attitude toward social norms, and inpudent behaviors.

The backgrounds of each type of delinquencies were studied in relation to the social change for the last few decades from the end of the war. It suggested that the macroscopic approach was necessary in the classification of juvenile delinquents.

The comparative study of dependent youths and inpudent youths with regard to the types and motives of delinquencies, social attitude, etc. led to the following conclusion. It is important and essential for the prevention of delinquencies of the latter type and the treatment of such delinquents to establish the adult authority and to aware them there is a limit to what they can do.