Senkoji is undoubtedly the most visited temple in Onomichi and is an icon of the city. Part of the Onomichi Temple Walk and temple number 10 of the Chugoku 33 Kannon Pilgrimage.
It is a Shingon temple reputedly founded by Kukai himself in 806. The main deity is a Thousand-Armed Kannon and is opened to the public every 33 years.
The temple buildings are scattered around the outcroppings of rock near the top of Mount Senkoji and great views over the town and the islands of the Inland Sea can be had.
The most famous and prominent rock is the "Jewel Rock", 50 meters in circumference and 15 meters high it is topped by a spherical "jewel" that legend says glows at night and illuminates the surrounding sea. The temple is also popular for its miniature Jizo.