Kotohira Shrine

Kotohira-gū Batsujoden: A Purification Hall on Mount Zōzu

On August 15, 2024, twelve wooden buildings standing in the upper precinct of Kotohira-gū were entered into Japan's register of Important Cultural Properties. The Batsujoden, a compact purification hall completed in 1878, is one of them. It is easy to walk past. The hall covers only about 42 square meters and sits among far larger structures, yet its presence is part of why the whole group earned national protection.

Kotohira-gū rises along the middle slope of Mount Zōzu in the town of Kotohira, Kagawa Prefecture. Most travelers know it simply as Konpira-san, the head shrine of a faith once carried across Japan by sailors and merchants. The main deity is Ōmononushi-no-kami, a guardian of seafaring, agriculture, medicine, and craft, worshipped here alongside the spirit of Emperor Sutoku.

The Batsujoden takes its name from harae (祓), the Shinto rite of cleansing that precedes formal worship. Worshippers who arrange to ascend to the Main Hall first receive a purification rite, and the hall's name records that role. The building is timber-framed, roofed in layered cypress bark (hiwadabuki), and topped with an irimoya hip-and-gable roof, the same vocabulary used across the rest of the designated group.

Why Twelve Buildings Were Designated Together

To understand the 2024 designation, it helps to know what stood here before. Until the Meiji period this was not a shrine at all but Konpira Daigongen, a Shingon Buddhist establishment governed by the Kongō-in cloister of Matsuo-ji on Mount Zōzu. The deity was a fusion of Buddhist and native belief, and the buildings carried Buddhist ornament.

The government's 1868 edict separating Shinto from Buddhism forced a complete change of identity. The Konpira Daigongen name was abolished, the site was reorganized as Kotohira-gū, and the precinct was rebuilt to suit a Shinto shrine. The twelve designated buildings, raised between 1874 and 1878, are the physical record of that conversion.

Their design makes the shift visible. The carpenters used shiraki, plain unpainted hinoki cypress, in place of colored Buddhist decoration. Curved members typical of temple architecture were largely replaced by angular joinery, and surfaces were finished with kiji-makie, gold lacquer applied directly onto bare wood. The Main Hall, raised in 1877, steps its floors and ceilings upward toward the inner sanctuary and uses many gables to give the roofline weight and rank.

The Agency for Cultural Affairs cited two grounds for designation: excellence of design and high historical value. The group preserves, in one connected precinct, how a major religious site remade itself during one of the sharpest cultural ruptures in modern Japanese history. For Kagawa Prefecture, this was the 32nd architectural property to receive Important Cultural Property status.

The full list runs to twelve structures: the Main Hall complex (honden, chūden, and haiden), its Naidokoro and Shinsen-den, the Bessha complex with its own Naidokoro and Shinsen-den, the Batsujoden, the Minami-watari-den corridor, the Kagura-den, the Mikashigi-ya, the Mikoshi storehouse, and the Shinko storehouse.

What to Look For on a Visit

The designated buildings are not open at their interiors to ordinary visitors, but their exteriors reward a slow look. Stand below the Main Hall and notice the unpainted cypress, almost silver where it has weathered, and the stacked gables above the worship hall. The restraint is deliberate. Where a temple would glow with vermilion and gilt, this shrine relies on the grain and color of the wood itself.

Follow the precinct around and you meet the Minami-watari-den, a long roofed corridor of about 40 meters that links the Main Hall with the Bessha. Rather than running straight, it bends to enclose an open court, a layout you rarely see at other shrines. The corridor matters in practice as well: roughly once a generation the Main Hall's cypress-bark roof is renewed, and the sacred object is moved along this passage to the Bessha while the work is done.

The Batsujoden itself stands near the route of formal worship. Its small scale is the point. Purification is a threshold, the moment before one approaches the deity, and the hall is sized for that quiet function rather than for display.

Around the Shrine

Reaching the Main Hall is its own undertaking. The stone stairway climbs 785 steps from the approach to the Main Hall, set at about 251 meters above sea level, and continues to 1,368 steps for those going on to the inner shrine, Izutama Shrine, near 421 meters. The approach is lined with shops selling the famous yellow amulets, sanuki udon, and Konpira sweets, which give the climb its rhythm.

Other treasures cluster nearby. The Asahi-sha, an earlier Important Cultural Property covered in fine carving, stands partway up. The shrine's Omote-shoin holds painted screens by Maruyama Ōkyo, including his tigers, designated as Important Cultural Properties in their own right. At the foot of the hill, the Kyū Konpira Ō-shibai, an early 19th-century kabuki playhouse also known as Kanamaru-za, is among the oldest surviving theaters of its kind in Japan.

Kotohira is reached on foot from JR Kotohira Station or the adjacent Kotoden station, both a short walk from the base of the approach. Parking in town is private and paid. The shrine keeps its older pilgrimage customs alive, including the tradition of konpira-inu, dogs once sent to make the pilgrimage on an owner's behalf, and pets are welcomed in the precinct, though not inside the buildings.