The Tokyo Jamii is the only Islamic building in the Turkish Ottoman style among more than 105 Islamic places of worship (mosques = masjids) in Japan, and its majestic pencil-shaped minaret and lead-roofed dome rising above Inokashira Street has become a daily sight in the town of Yoyogi Uehara. Before discussing the future of the Tokyo Jamii, let us look at the development of the Muslim community in Japan in the post-war period and the challenges it faces, tracing the growth of the Muslim population and the establishment of places of worship.