Tenkaisan Oya Temple

Tenkaisan Oya Temple (天開山大谷寺, Tenkaisan Ōyaji) is a striking Buddhist temple built directly into the soft Oya stone cliffs on the outskirts of Utsunomiya. Founded in 810 by Kobo Daishi, the father of Shingon Buddhism, the temple is renowned for its “cave” architecture, where the main hall protects ancient stone reliefs. The centerpiece is a four-meter-tall Senju Kannon (Thousand-Armed Goddess of Mercy), carved directly into the rock face. As the oldest stone relief Buddha in Japan, it is designated as both a Special Historic Site and an Important Cultural Property. While the guided tours are conducted in Japanese, English leaflets are available to help international visitors navigate the temple’s ten distinct carvings.

The temple grounds also feature a serene Japanese garden centered around a traditional red bridge. Near the water, visitors can see a white snake statue resting on the rocks, a nod to the local legend of “Hell Valley.” It is said that Kobo Daishi purified a venomous snake that once poisoned the local waters; after his intervention, the snake turned white as a sign of its newfound protective nature. Just outside the temple entrance stands the Heiwa Kannon, a towering 27-meter-tall statue carved by hand over six years to commemorate those lost in WWII. Together, these sites offer a profound look at the region’s unique stone-carving heritage and spiritual resilience.

Visitor Information
Address	1174 Oyamachi, Utsunomiya, Tochigi 321-0345 (Google Maps)
Opening Hours	9:00 AM – 5:00 PM (Apr–Sept) / 9:00 AM – 4:30 PM (Oct–Mar) Closed: Dec 19 – Dec 31; also closed on most Tuesdays from Dec to March.
Price	Adults: ¥500 / High School: ¥300 / Junior High & Elementary: ¥100
Website	Visit Website

Access
Station / Stop	Line / Bus	Access Details
JR Utsunomiya Station	Kanto Bus (Platform 6)	Take the bus bound for Oya/Tategunari to Oya Kannon-mae (30 mins), then walk 2 mins
Oya History Museum	Walk	A 10-minute walk through the stone-quarrying district connects the two sites