As our International Criminological Society is to take up the subject of delinquency area in the international field of view, herein I forward a report on this subject regarding Tokyo, the capital of Japan.

In our country also, there have been a number of studies following the precedent of Cliford R. Shaw. Of such studies a treatise on “Geographical Distribution of Juvenile Delinquency”, a study announced by Shigeo Saeki, one of my student and at that time a technical officer of Metropolitan Police Board in charge of psychology was a forerunner. Before Saeki there were some reports of study, if mention is to be made, but these were done in an old form of study which dealt with larger areas as units of geographical distribution. Contrary to these, Saeki took up the delinquency areas within the metropolis of Tokyo as subject of study. In his study he took up the juvenile delinquency known to the police in Tokyo during 1950 as materials.