Hioka Shrine is a historic Shinto shrine located in Ono, Kakogawa-cho, Kakogawa City, Hyogo Prefecture. With a history stretching back to ancient times, it has long served as an important center of local worship. The shrine is particularly renowned for prayers for safe childbirth, attracting expectant parents and families from across the eastern Harima region.
The shrine stands at the southern foot of the Hioka Hills, on the left bank of the Kakogawa River in southern Hyogo Prefecture. The name Hioka is also associated with the historical place-name Kako, reflecting the area’s long connection with ancient regional history.
Hioka Shrine is mentioned in the Harima no Kuni Fudoki, an early regional chronicle compiled in the Nara period. These ancient records demonstrate that the deity worshipped here was already an object of reverence more than a thousand years ago. Today, the shrine remains widely known for its association with safe childbirth, a tradition rooted in the story of its principal deity praying for the safe delivery of Harima Inabi no Ōiratsume, the empress of Emperor Keikō, Japan’s 12th legendary emperor.
The principal deity of Hioka Shrine is Ame-no-Isasahiko-no-Mikoto. Four other deities are also enshrined here: Toyotamahime-no-Mikoto, Ugayafukiaezu-no-Mikoto, Amaterasu-Ōmikami, and Ichikishimahime-no-Mikoto.
Historical documents indicate that the deity associated with Hioka changed in name or identity over time. The Harima no Kuni Fudoki refers to Iwatsuhiko-no-Mikoto as a deity residing at Hioka, while the Engishiki, a 10th-century compilation of court regulations and shrine records completed in 927, lists the shrine as Hioka ni Masu Ame-no-Isasahiko Jinja. The precise identity and origins of Ame-no-Isasahiko-no-Mikoto remain unclear, but the deity is now especially revered for protection during pregnancy and childbirth.
The exact date of Hioka Shrine’s founding is unknown. According to shrine tradition, it was established during the eastern expedition of Emperor Jimmu, Japan’s legendary first emperor, to subdue a turbulent deity. Another theory places its foundation in 730, during the Nara period.
The surrounding Hiokayama area contains several burial mounds dating from the early to middle Kofun period, roughly from the third to sixth centuries. Among them is Hioka-ryō Kofun, traditionally identified as the tomb of Harima Inabi no Ōiratsume, the consort of Emperor Keikō. These ancient burial sites reflect the area’s importance in the history and traditions of the region.
The Harima no Kuni Fudoki, believed to have been compiled around 715, includes a reference to the deity of Hioka in its account of Kako District. The Engishiki later recorded the shrine under the name Hioka ni Masu Ame-no-Isasahiko Jinja, recognizing it among the shrines officially listed in that period.
In 1578, during the Sengoku period of civil war, the shrine buildings were destroyed by fire during military conflict, and earlier records were lost. During the Edo period, the shrine received land donations from Ikeda Terumasa, strengthening its position as an important place of worship in the area. Following the Meiji Restoration, it was classified as a gōsha, a local shrine ranking within the modern shrine classification system. It continues to attract worshippers today.
The Edo-period document Gokai Yuraiki recounts a legend in which Hinata Myōjin, the deity of Hioka Shrine, worked together with Prince Shōtoku to construct the Gokai irrigation canal on the left bank of the Kakogawa River. The story may have developed from historical accounts of the priest Monkanbō Kōshin, who served at the shrine and is believed to have undertaken repair work on the irrigation system. Over time, this local historical memory may have evolved into the legend preserved in the document.
The present shrine buildings were reconstructed in 1971. Built with reinforced concrete in the gongen-zukuri architectural style, they combine modern construction techniques with the traditional layout associated with Shinto shrines. The sturdy structure continues to serve as the spiritual center of this ancient place of worship.
Several smaller shrines stand within the grounds, allowing visitors to pay their respects to a variety of deities.
Iyokawara Hioka Shrine, also known as Ōtorii Shrine: Dedicated to Ame-no-Isasahiko-no-Mikoto, this shrine was relocated from within Kakogawa City in 1971.
Takamikura Shrine: Located behind and to the right of the main shrine, it enshrines Ōkuninushi-no-Mikoto and Kotoshironushi-no-Mikoto.
Tenman Shrine: Situated to the left of the main shrine, it is dedicated to Sukunahikona-no-Mikoto and the scholar Sugawara no Michizane.
Ebisu Shrine: Also located to the left of the main shrine, it enshrines Hiruko-no-Mikoto, a deity associated with Ebisu worship.
Inari Shrine: Dedicated to Ukemochi-no-Kami, a deity associated with food and sustenance, this shrine stands on the left side of the main sanctuary.
Sumiyoshi Shrine: Near the entrance to the grounds, this small stone shrine enshrines the three Sumiyoshi deities: Uwatsutsunoo-no-Mikoto, Nakatsutsunoo-no-Mikoto, and Sokotsutsunoo-no-Mikoto.
Kumano Shrine: Another small stone shrine near the entrance, it is dedicated to Izanagi-no-Mikoto and Izanami-no-Mikoto, the divine couple associated with the creation of the Japanese islands in mythology.
The shrine grounds also feature a zuishinmon, a traditional gate associated with guardian figures, and a large torii gate marking the approach to the sacred precinct. These structures welcome visitors and help create a transition from the everyday world into the shrine’s spiritual setting.
Hioka Shrine brings together ancient chronicles, local legends, traditional architecture, and centuries of religious devotion. Its reputation for prayers for safe childbirth remains central to its identity, while the surrounding burial mounds and associated shrines offer further insight into the area’s past. For visitors exploring Kakogawa and the wider Harima region, Hioka Shrine provides an opportunity to experience a living tradition rooted deeply in Japan’s ancient history.