Buddhism came to Japan in the middle of 6 century. Supporters of Buddhism won a victory in the political power struggles of the time. Building temples in every area under government patronage, it spread throughout the country. In the Kamakura period- 1185 to 1333-, as a number of new leader appeared and deepened its philosophy, Buddhism made clear its position of saving the weak. Zen Buddhism was brought to Japan in the Kamakura period by priest who studied in china, and it flourished principally as the religion of Samurai. At present, a culture in Japan that has Buddhism as its backdrop has laid roots deeply in the lives of the people and, together with Shinto, Forms the spiritual culture of the Japanese people. Also, even today now sects of Buddhism keep emerging and gaining believers.