Sannomiya Shrine is a historic Shinto shrine located in Okubo, Yoshioka Town, Kitagunma District, Gunma Prefecture. Traditionally said to have been founded during the Nara period (710–794), the shrine has long served as the guardian shrine of the Okubo area and has been an important center of local faith.
The shrine remains deeply connected to the local community. During its spring festival, traditional performances such as lion dances and kagura sacred dances are dedicated to the deities, preserving local customs and culture that have been passed down through generations.
Sannomiya Shrine is also associated with the historical title of “Sannomiya of Kozuke Province”, reflecting its longstanding importance in the religious history of the region. Its main hall and sacred object are regarded as valuable cultural properties and were designated Important Cultural Properties of Yoshioka Town on February 22, 1988.
Three deities are enshrined at Sannomiya Shrine:
Hikohohodemi-no-Mikoto: The principal deity, known from the Japanese myth of the Sea Prince and Mountain Prince. He has traditionally been worshipped as a guardian of agriculture, fishing, and everyday life.
Sukunahikona-no-Mikoto: A deity associated with medicine, healing, and industry.
Toyotama-hime-no-Mikoto: A deity associated with the sea and maritime traditions.
Together, these deities have been revered as protectors of people’s livelihoods and well-being.
The founding of Sannomiya Shrine is traditionally dated to 750, during the Nara period. According to tradition, a deity was enshrined at this location, although the precise circumstances surrounding its establishment are not known.
Nevertheless, old documents and Shinto-related records suggest that the area was an important center of religious worship from an early period, making the shrine an important part of the region’s long religious history.
The medieval work Shinto-shu describes the deity of Ikaho as descending from the mountains and being enshrined at Sannomiya in the village. Based on this tradition, Sannomiya Shrine is considered to have possibly served as the satomiya, or village shrine, of Ikaho Shrine in Ikaho, Shibukawa City.
In traditional Japanese mountain worship, a shrine located in the mountains could be regarded as a yamamiya, or mountain shrine, while a shrine at the foot of the mountain could serve as a satomiya, or village shrine. This system allowed the same sacred tradition to be maintained in both the mountains and settlements.
Ikaho Shrine has ancient religious traditions associated with the volcanic activity of Mount Haruna. Sannomiya Shrine may have served as a village center supporting this worship. It is also thought that the shrine may have played an especially important religious role in the area before Ikaho Onsen developed into a major hot spring destination.
The Engishiki, a collection of laws and regulations compiled during the Heian period, contains the Engishiki Jinmyocho, a register of officially recognized shrines completed in 927. It lists “Ikaho Shrine” among the important shrines of Gunma District in Kozuke Province.
Historical records also indicate that the deity of Ikaho was gradually awarded increasingly high divine ranks during the Heian period. In the ninth century, the deity was elevated from Junior Fifth Rank, Lower Grade to Junior Fourth Rank, Upper Grade, eventually reaching the exceptionally high rank of Senior First Rank.
This high status reflects the importance attached to the Ikaho deity in ancient Kozuke Province, placing it among the region’s most highly regarded religious traditions alongside such major shrines as Nukisaki Shrine and Akagi Shrine.
The sacred object of Sannomiya Shrine is an Eleven-Headed Kannon statue. The approximately 90-centimeter-tall standing statue is carved from a single block of wood and is believed to date from around the Muromachi period (1336–1573).
The presence of a Buddhist statue as the sacred object of a Shinto shrine is a notable example of Shinbutsu-shugo, the historical blending of Shinto and Buddhism. For centuries, Japanese religious traditions often regarded kami and Buddhist deities as interconnected, and Sannomiya Shrine preserves an important reminder of this history.
The present main hall was rebuilt during the Kaei era in the mid-19th century. Constructed entirely of Japanese cypress, it features the nagare-zukuri architectural style, characterized by a gracefully extended curved roof, and is covered with copper roofing.
The main hall and sacred object are considered historically valuable and have been designated Important Cultural Properties of Yoshioka Town. Standing quietly within the shrine grounds, the building conveys the character of traditional shrine architecture and the long history of local worship.
The shrine’s spring festival is held annually on the first Sunday of April, when traditional performing arts are dedicated to the shrine’s deities. One of the highlights is Daitai Kagura, a form of sacred Shinto dance.
The tradition was once discontinued but was revived in 1947 by local residents. Today, it is preserved and performed by a local group known as Sanrakuko.
The repertoire includes dances based on Japanese mythology, such as Tobiraki no Mai and Ame-no-Ukihashi no Mai, as well as dances associated with prayers for a plentiful harvest, including Hiruko no Mai and Tenko no Mai. A total of 11 performances have been passed down.
It is the only revived Daitai Kagura tradition in Yoshioka Town and has been designated a Yoshioka Town Intangible Important Cultural Property.
Another traditional performance presented during the spring festival is the Inari-ryu Sasara Lion Dance. This traditional dance is said to have been performed since the Tensho era in the late 16th century.
Three dancers representing lions wear distinctive lion heads known as kegeshishi and perform a vigorous dance accompanied by flutes and drums. The three lions—known as the front, middle, and rear lions—move together in coordinated performances that are both powerful and visually striking.
The dance is also traditionally associated with rainmaking rituals. During periods of prolonged drought, the performers are said to have climbed to Funao Falls to pray for rain.
The Inari-ryu Sasara Lion Dance has also been designated a Yoshioka Town Intangible Important Cultural Property.
Sannomiya Shrine stands in a peaceful setting surrounded by the natural landscape of the local area. Passing through the torii gate, visitors find the kagura hall and main sanctuary quietly standing within the grounds, creating an atmosphere where the shrine’s long history can be felt.
For local residents, the shrine remains an important place for everyday prayers and seasonal ceremonies. It has been carefully preserved through generations and continues to play a role in community life.
For visitors, Sannomiya Shrine offers an opportunity to discover a less-known side of Gunma’s history and religious culture while experiencing the quiet atmosphere of a traditional local shrine.
Sannomiya Shrine is approximately 3 minutes by car from the Komayose Smart Interchange on the Kan-Etsu Expressway, making it a convenient stop when exploring Yoshioka Town by car.
The surrounding area also offers natural attractions, hot springs, and other sightseeing destinations, making the shrine a worthwhile historical stop during a drive through the region.
Sannomiya Shrine is a historic place of worship traditionally associated with the Nara period and the ancient religious traditions of Kozuke Province. Its connection with Ikaho Shrine, its Eleven-Headed Kannon sacred object, historic main hall, and traditional performing arts all reflect the complex religious and cultural history of Japan.
A visit provides an opportunity to quietly explore the shrine grounds while reflecting on centuries of worship and discovering the traditional culture that continues to be preserved by the local community of Yoshioka.