Japan records an unusual 20's suicide rate in the late 1950s. The suicide rate is unprecedented globally as well. At that time the Japanese newspaper wrote articles on suicide in youth in their twenties, but at the level of research there is no example of deeply considering its causes and meanings. More remarkable is that the generation that was in his 20s in the late 1950s again shows a high suicide rate in the latter half of the 1990s. The suicide problem of Japanese 20's in the latter half of 1950s is a problem that will undermine Japanese society after the war. In this paper, I focused on such facts, and explored the cause of suicide in young people in their twenties in the latter half of the 1950s from war experiences, and pointed out the problem of Japanese postwar memories appearing in this issue.