This thesis employs an approach of discourse analysis on male homosexuality in postwar Japan from the viewpoint of the tense relations between Japanese cultural nationalism and the globalisation/Westernisation, along with the shifts of discourses of sexuality in the United States and the UK. Through analysing the discourses of sexuality in post-war Japan, I will theoretically indicate the historical and political relationship between problems of gender and sexuality, and national problems such as national identity between Japanese and Western cultures, ideal image of the nation, and its modern development. Firstly, I argue the works of Mishima Yukio (1925-1970), who is one of the representative writers in post-war Japan, especially famous for his gaythemed works and far-right political activism including his attempt of coup d'état. Then, I explore the political dynamics of gay shame in Japan, focusing on Togo Ken (1932-2012), a pioneer of Japanese gay activism who had challenged national elections since 1971 as an openly homosexual candidate. Next, I discuss how the AIDS crisis has changed the discourses of sexuality and the sense of national and cultural borders in Japan. I then discuss the Japanese homonormativity in the 2000s, analogous to Lisa Duggan's new homonormativity in the US context. Finally, I analyse Japanese ‘LGBT' political phenomena under the transnational influence of the Obama administration's LGBT-friendly policy in the contemporary Japan, and point out problems under the influences of ‘global' LGBT activism in contemporary Japanese society.