This cypress bark gable-roofed four-legged gate retains Kamakura period detailing such as its frog-leg struts and is said to be the Gekka-mon Gate of Kyoto Imperial Palace that was granted to Sanetsune ICHIJO by Emperor Kameyama when he built Joraku-an in 1268.
板蟇股（かえるまた）など細部にわたり鎌倉時代の特色をよく残す切妻造・檜皮葺木の四脚門で、文永5年(1268年)に一条実経が常楽庵を建立した際に亀山天皇が京都御所の月華門を下賜されたと伝えられる。