Donald Robinson presented a paper titled "Made in America? Origins of the Constitution of Japan" at the 1997 Annual Meeting of the American Political Science Association. He gave a thesis on origins of the Constitution of Japan as follows : The making of the Constitution of 1946 was a collaborative achievement. The purpose of this paper is to review his analyses of the making process of the constituiton, focusing on Chapter I-The Emperor and then to provide a critical discussion of his thesis.