Standing next to the two-story pagoda, the main hall is an Important Cultural Property designated by the Japanese government. It also used to be called “Bishamon-do” or “Yakushi-do.” The hall has a hipped tiled roof with a ridge height of 3.8 meters. The four sides are 5.4 meters wide with a kohai (eave) of 1.8 meters wide. Based on the style of architecture, it is estimated that the hall was established in the Kamakura period (1185-1333). An image of Yakushi Nyorai is enshrined as the principal image in the shrine, with images of Kobo Daishi and Shaka Nyorai standing next to it on its right and left sides, respectively. A kokerakyo, a bundle of approximately 30-cm-long, 1-cm-wide cedar board pieces with Buddhist scriptures ink-penned on them, is also kept in the hall.