This paper discussed on many philosopher’s views of peace. I doubted totalitarian character of Nishida Kitaro who aligned himself with militarism, and reflexed Heidegger’s metaphysic which accepted Hitler's suggestion, and wondered how Jewish Arendt assented to German Heidegger. Arendt found out ‘The banality of Evil’, and thought that living without thinking was the origin of political evil. Buddhist egalitarianism is contradictory to Hindu caste system. Skillful action did not make Karma in Buddhism, but hereditary classes cannot be overcame by one's exertion in Hinduism. In later years, Mahayana Buddhism lost its identity and became such a part of Hinduism as Bhagavadgītā. Kant concerned about current politics as much as his speculative critics. He judged Western imperialism vicious, and vindicated Chinese and Japanese actions on it. Kant was busy not only to clear the limit of reason but also to dream of eternal peace in the real world. Foedus Amphictyonum like contemporary U.N. should be considered for the world peace. Galtung invented a peace study, and divided the conception of peace into the negative and the positive. Negative peace is a peaceful status under the power. Walzer maintains a concept of ‘Just War’ concept although it needs lots of conditions. Walzer’s Just War might be Galtung’s negative peace. Eichman’s court, a war criminal trial, should be an ideal example of ‘the crime against humanity’ in future ages. Buddhist ethics might be expected not as general religions do, but as a concrete doctrine endeavoring to achieve the world peace in detail. Kant emphasized individual moral maturity, but human responsible subjectivity is not accomplished yet. We had to talk about massacre rather than peace. One of jobs for philosophers is a discovery for the structure of violence behind metaphysics.