There were a conflict for the leadership inside the Hojo clan who exclusively possessed shikken no shiki (title of the regent) as the backdrop, and the dissatisfaction of gokenin (immediate vassals of the shogunate in the Kamakura and Muromachi through Edo periods) who felt antipathy to the Hojo clan's tyranny, and tried to increase the power of the shogun as one of the factors.
背景には、執権職を独占する北条氏内部の主導権争いと、北条氏の専横に反感を抱き将軍権力の浮揚を図る御家人たちの不満が要因にあった。