Mangan-ji (満願寺) is a Buddhist temple located in the Setagaya Ward of Tokyo, Japan.

Around this time, the mountain name was changed from Iozan (医王山) to Chikozan (致航山) and its primary object of worship was changed from Yakushi Nyōrai to Dainichi Nyōrai; however, the temple was more famous as spot for popular worship for its statue of Jizo Bosatsu, which in popular imagination was thought to be able to grant a single wish to any worshipper.

[1] The temple has the grave of Hosoi Kōtaku (1658-1736) a noted Edo period Confucian scholar, calligrapher and seal carver.

According to temple legend, a Heian period priest named Kakuban dreamt that he needed to enshrine this statue somewhere in Musashi Province in a place with abundant water.

After searching for a suitable location, he selected the Todoroki Ravine, with its river and several waterfalls.