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We are at the beginning of the new era of international relations. Recently, theorists of international relations began to describe and explain the characteristics of this new era and delineate its main features. The expansion of legal and democratic contexts of international order, diminishing state's role and establishing of a
multiple system of authority are main trends of contemporary world.
This essay considers the idealistic origins of this development in kant's reflection on international relations. His reflection based not on legal procedure but refers to reason and deduces principles of right, individual freedom and legality from it. Then, take this as a foundation of domestic and international relations. Freedom and
equality are ultimate ends for kant. He applied these principles in national, federative and cosmopolitan levels. Then, author examines the adjustment of this themes in post kantianism of
international relations.