In general, children at the beginning of their adolescence start to realize the pressure from general public ("the world" according to Heidegger), who force ordinary opinions on them, and feel reluctance to keep being "good children" or "cute kids" indefinitely. In addition, they tend to try to recognize the pressure from the "ordinary world" as something unrelated to them by belonging to an "extraordinary world" in many cases. Some children in their adolescence choose an "outlaw world" as an extraordinary world and fall into delinquency. However, they cannot discard their attachment to the ordinary world completely and end up as part-time outlaws going back and forth from the ordinary to the extraordinary worlds. Therefore, we can regard their delinquency as "play" defined by Gadamer, H. G., a German philosopher, that is "aimless reciprocating motion with no end and vague purpose". In reality, juvenile delinquents in the post-war Japan have committed immoral acts, in every "period of frequent delinquency", that can be recognized as "play" in the Gadamer's theory, which is a "reciprocating motion" between the "ordinary world" and an "extraordinary world". This study aims to clarify the above-mentioned by analyzing the statistical data of governments.

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