Owari Okunitama Shrine Tower Gate

The Rōmon Gate of Owari Ōkunitama Shrine: A Monumental Gateway Spanning Two Eras

Standing proudly at the entrance to one of Aichi Prefecture's most historically significant shrines, the Rōmon Gate (tower gate) of Owari Ōkunitama Shrine is a designated Important Cultural Property of Japan. This magnificent two-story wooden gate is a rare architectural treasure that seamlessly blends the building techniques of two distinct historical periods—the Muromachi era and the early Edo period. Located in the city of Inazawa, just a short train ride from Nagoya, this gate serves as the solemn threshold to a shrine complex that has been the spiritual heart of the Owari region for well over a millennium.

A Shrine of Ancient Origins

Owari Ōkunitama Shrine, commonly known as Kōnomiya or Konomiya, is believed to have been established as early as the seventh century, though its exact founding date remains unknown. During the Nara period (710–794), the shrine stood adjacent to the provincial government office (kokuga) of Owari Province, and was designated as the sōja—the principal shrine representing all the deities of the province. The provincial governor himself conducted important rituals here, and this prestigious role gave the shrine its popular name, Kōnomiya, meaning "Shrine of the Provincial Capital."

The enshrined deity is Owari Ōkunitama no Kami, the great land spirit of the Owari region. This deity embodies the sacred power of the earth itself, revered by the ancestors of the Owari people who settled and cultivated this fertile plain. Near the main sanctuary, five large natural stones arranged in a circle form an iwakura—a primitive sacred site that predates any constructed buildings and attests to the shrine's extraordinarily ancient origins.

The Rōmon Gate: Architecture Bridging Two Centuries

The Rōmon Gate is classified as a sanken-ikko rōmon—a three-bay, single-entrance tower gate—with an irimoya-zukuri (hip-and-gable) roof covered in hinoki bark (hiwadabuki). Its lower story was originally constructed during the early Muromachi period (approximately the late fourteenth to fifteenth century), making it one of the oldest surviving shrine gate structures in the Aichi region.

In 1646 (Shōhō 3), the gate underwent a major dismantling and restoration. During this extensive repair, the entire upper story was rebuilt, incorporating the architectural techniques and aesthetic sensibilities of the early Edo period. This resulted in a remarkably unusual structure where the lower and upper stories each represent a different era's craftsmanship, offering visitors and architectural scholars a living textbook of Japanese construction methods spanning roughly two hundred years.

Three historic ridge-pole plaques (munafuda) are preserved as appendages to the designation, providing invaluable documentary evidence of the gate's construction and renovation history. The gate was officially designated as an Important Cultural Property of Japan on June 22, 1955.

Why the Rōmon Gate Is Designated an Important Cultural Property

The designation of the Rōmon Gate as an Important Cultural Property rests on several key factors. First, the lower story preserves authentic Muromachi-period construction techniques that are increasingly rare among surviving shrine architecture. Second, the juxtaposition of Muromachi and Edo-period building methods within a single structure makes it an exceptionally valuable resource for the study of Japanese architectural evolution. Third, the gate's documentary records—including the three munafuda—provide a detailed historical timeline that enhances our understanding of how religious buildings were maintained and renovated over centuries. Together with the adjacent worship hall (haiden), which is also an Important Cultural Property, the Rōmon Gate forms part of one of the finest examples of the Owari-zukuri architectural style, a regional layout unique to Aichi Prefecture.

Highlights and Things to See

Passing through the Rōmon Gate is the traditional way to enter the shrine grounds, and the experience is profoundly atmospheric. As you walk beneath the heavy timbers of the lower story and look up at the Edo-period upper story above, you are literally stepping through layers of history. Beyond the gate, the shrine complex unfolds in the distinctive Owari-style layout: the worship hall (haiden), connecting hall (watadono), liturgy hall (saimonden), east and west corridors (kairō), and the main sanctuary (honden) are all arranged in a linear configuration that is unique to this region.

The worship hall, another Important Cultural Property dating from the early Edo period, features a distinctive kirizuma-zukuri (gabled) design with rare parallel interior pillars. Behind the main sanctuary, the mysterious iwakura circle of five great stones invites quiet contemplation of the shrine's prehistoric roots.

The shrine also preserves several treasures designated as Inazawa City Cultural Properties, including a large iron bell (ōnarusuzu) from the Nanbokuchō to Muromachi period, ceramic guardian lion-dogs (komainu), and an ornate lacquered lion mask (shishi-gashira)—all from the Muromachi period.

The Hadaka Matsuri: A Living Tradition

Owari Ōkunitama Shrine is nationally famous for its Naoi Shinji, popularly known as the Hadaka Matsuri (Naked Festival), held annually on the thirteenth day of the first month of the old lunar calendar—typically falling in February or early March. This extraordinary ritual traces its origins to 767 CE, when Empress Shōtoku ordered prayers for the expulsion of plagues to be conducted at national temples across Japan, and the governor of Owari Province performed the rite at this shrine.

During the festival, thousands of men clad only in white loincloths converge on the shrine grounds, each seeking to touch the shin-otoko (divine man)—a specially chosen individual who absorbs the sins and misfortunes of the community. The resulting surge of bodies creates one of the most dramatic and visceral festival scenes in all of Japan. Afterward, the shin-otoko is symbolically expelled from the town, carrying away the community's accumulated impurities. For visitors, the Hadaka Matsuri offers an unforgettable glimpse into the raw spiritual energy of Japanese folk religion.

Nearby Attractions

A visit to Owari Ōkunitama Shrine can be combined with several other cultural experiences in the Inazawa and wider Owari area. Shōkai-ji Temple, also in Inazawa, is a Shingon Buddhist temple founded by Kōbō Daishi with Important Cultural Property buildings including a main hall and pagoda; it is particularly famous for its spectacular Hydrangea Festival held each June, when over 10,000 hydrangea plants burst into bloom in the adjacent Ōtsuka Shōkai-ji Historical Park. The Inazawa Ogisu Memorial Art Museum showcases the works of Ogisu Takanori, a locally born painter who achieved renown in Paris.

Kiyosu Castle, the fortress from which Oda Nobunaga launched his campaign toward national unification, stands just a few kilometers to the east and offers exhibits on Sengoku-period history. The nearby Aichi Asahi Archaeological Site Museum preserves one of Japan's most important Yayoi-period settlement sites. For those traveling farther afield, the National Treasure Inuyama Castle and the historic Atsuta Shrine in Nagoya are both within easy reach.