The discussions on peace in Japan have significantly changed since the end of the Second World War. This can be clearly illustrated by the development of the peace studies field, which has been strongly influenced by the pacifism of Article 9 of the Japanese Constitution and the experiences of the nuclear attacks on Hiroshima and Nagasaki. This article traces the historical development of Japanese peace studies and analyzes its characteristics. Since pacifism has been accepted as the key element for understanding political culture in Japan since 1945, peace research, the practice of peace education, and peace museums are also regarded as important factors that constitute Japanese peace studies and peace culture.