Oyamadera Main Hall: A Meiji-Era Buddhist Temple on Sacred Mount Oyama
Nestled on the forested slopes of Mount Oyama in Isehara, Kanagawa Prefecture, the Main Hall (Hondo) of Oyamadera is a magnificent example of Meiji-period Buddhist architecture. Registered as a National Registered Tangible Cultural Property in March 2024, this grand esoteric Buddhist hall stands as a powerful testament to the enduring devotion of the faithful who rebuilt their beloved temple after its destruction during the anti-Buddhist upheaval of the early Meiji era. With its commanding presence, elaborate wood carvings, and deep historical roots stretching back to the year 755, Oyamadera's Main Hall offers visitors a remarkable window into the spiritual heart of the Oyama pilgrimage tradition.
A History Spanning Over 1,200 Years
Oyamadera traces its origins to the year 755 (Tenpyo Shoho 7), when Roben Sojo, the first head priest of Todai-ji in Nara, is said to have founded the temple by imperial order of Emperor Shomu. The temple became a major center of mountain asceticism (Shugendo), blending esoteric Buddhist practice with ancient mountain worship centered on the stone deity (Sekison Gongen) enshrined at the summit of Mount Oyama.
During the Kamakura period, the warlord Minamoto no Yoritomo offered prayers at Oyamadera, and in the mid-13th century, the monk Gangyo Kenjo revitalized the temple, commissioning the celebrated iron-cast statues of Fudo Myoo (the Immovable Wisdom King) and two attendant figures—now designated as National Important Cultural Properties. These remarkable iron statues are among the largest and finest examples of their kind in Japan.
In the Edo period, Oyama pilgrimage (Oyama Mairi) became enormously popular among the common people of the Kanto region. Pilgrimage associations (Oyama-ko) were organized across a wide area, and the mountain's approach roads bustled with travelers seeking blessings for bountiful harvests, successful business, and family well-being. At its height, records indicate over 15,700 pilgrimage groups and approximately 700,000 affiliated households.
Destruction and Rebirth: The Story of the Main Hall
The sweeping anti-Buddhist policies (Haibutsu Kishaku) of the early Meiji era devastated Oyamadera. The original temple complex, located where the Afuri Shrine Lower Shrine now stands, was dismantled, and the monks were dispersed. However, the fervent faith of Oyamadera's many devotees ensured the temple's survival. Remarkably, the principal images—including the iron Fudo Myoo triad—were saved from destruction by believers who risked everything to protect them.
Construction of the present Main Hall began with donations from devotees across the nation, and zelkova timbers were contributed by villages within a five-ri (approximately 20-kilometer) radius. After nine years of arduous construction on the steep mountainside, the hall was completed in 1885 (Meiji 18). The master carpenter was Tenaka Myoo Taro, a hereditary temple builder whose family lineage of service to Oyamadera is said to date back to the temple's founding in the 8th century.
Why the Main Hall Was Registered as a Cultural Property
In March 2024, the Main Hall of Oyamadera was officially registered as a National Registered Tangible Cultural Property (building). The registration recognizes the hall as a large-scale modern Buddhist temple that conveys the prosperity of the Oyama pilgrimage tradition. Key factors in the registration include its impressive scale, its well-preserved esoteric Buddhist floor plan, and its outstanding decorative wood carvings.
The hall measures five bays wide and five bays deep (approximately 248 square meters), with a hip-and-gable roof clad in copper sheets shaped to resemble tiles. The interior follows a classic esoteric Buddhist layout: the front two bays form the outer sanctuary (gejin), while the rear three bays are divided into the inner sanctuary (naijin) and side chambers (wakijin). The robust pillars standing in dense array create a powerful sense of grandeur.
Architectural Highlights and Decorative Carvings
One of the most striking features of the Main Hall is the elaborate canopy-style Chinese gable (noki karahafu) over the front entrance porch (kobai). The wooden nose-pieces (kibana) are carved with dynamic dragon figures, and additional carvings of mythical creatures and floral motifs adorn the structure, showcasing the remarkable skill of the Tenaka Myoo Taro carpentry lineage. These carvings are among the finest examples of Meiji-period temple ornamentation in the Kanto region.
Inside the hall, five goma (fire ritual) platforms are set up for the annual Godan Goma ceremony held on February 28, during which monks perform a spectacular ritual of burning offerings on five simultaneous sacred fires to pray for the removal of worldly desires and the fulfillment of wishes.
Treasures of Oyamadera
Beyond the Main Hall itself, visitors can appreciate several nationally and prefecturally designated cultural properties housed within the temple. The iron-cast Fudo Myoo triad (National Important Cultural Property), dating from the Kamakura period (around 1270), stands in the Hoan-den hall behind the main altar. The central figure of Fudo Myoo, standing approximately 97.7 centimeters tall, wields a sword and lasso with a fierce expression characteristic of this protective deity. These are the largest and most accomplished iron Buddhist statues in Japan.
The temple also houses a wooden seated Fudo Myoo image from the late Heian period (Kanagawa Prefectural Important Cultural Property), notable for its gentle expression and softly rendered drapery—a rare example of Heian-era Buddhist sculpture in the prefecture.
Visitor Highlights and Seasonal Attractions
Oyamadera is one of the most celebrated autumn foliage spots in the Kanto region. The approach stairs leading to the Main Hall are lined with maple trees that blaze crimson in November. During the peak season, the temple grounds are illuminated at night, and the cable car extends its operating hours, allowing visitors to enjoy the stunning combination of glowing red leaves and the twinkling night views of the Kanto plain below.
Another beloved activity is kawarake-nage, a traditional practice of throwing clay discs from a cliff overlooking the valley. If the disc passes through a ring called the Fukuwa (Ring of Fortune) set up on the cliffside below, the thrower is said to receive good luck and the removal of misfortune.
The temple also hosts the Hoshi Matsuri (Star Festival) at the winter solstice, offering prayers for good fortune in the coming year, and is the first pilgrimage site on the Kanto Thirty-Six Fudo circuit.
Surrounding Attractions
Mount Oyama and its surroundings offer a full day of exploration. Afuri Shrine Lower Shrine, located further up the mountain, provides breathtaking panoramic views and houses a sacred spring. The charming Koma Sando approach road is lined with tofu restaurants—Oyama tofu is a local specialty dating back to the Edo-period pilgrimage days. Hikers can continue to the 1,252-meter summit of Mount Oyama for sweeping views of Sagami Bay, the Tanzawa mountains, and on clear days, Mount Fuji. The Oyama Cable Car connects the base to Oyamadera Station and Afuri Shrine Station, making the mountain accessible to visitors of all fitness levels.
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Q&A
- When was the Main Hall of Oyamadera built, and why?
- The current Main Hall was completed in 1885 (Meiji 18). It was rebuilt by devotees after the original temple complex was destroyed during the anti-Buddhist movement (Haibutsu Kishaku) of the early Meiji era. Donations came from believers across Japan, and the construction took nine years due to the challenging mountain terrain.
- What cultural property designation does the Main Hall hold?
- The Main Hall was registered as a National Registered Tangible Cultural Property (building) on March 6, 2024. It is recognized as a large-scale Meiji-era esoteric Buddhist hall that reflects the historical prosperity of the Oyama pilgrimage tradition.
- How do I get to Oyamadera?
- From Isehara Station on the Odakyu Line, take the bus bound for "Oyama Cable" (about 25–30 minutes) to the last stop. Walk approximately 15 minutes to the Oyama Cable Car base station, then ride the cable car for about 3 minutes to Oyamadera Station. The temple is a 2-minute walk from the station.
- What is the best season to visit?
- Autumn (mid-November) is the most popular season, when the maple-lined stairs are ablaze with red and gold foliage and the temple offers evening illumination. However, the temple is beautiful year-round: fresh green maple leaves in spring and summer, and the serene Hoshi Matsuri ceremony at the winter solstice are also highlights.
- What is kawarake-nage?
- Kawarake-nage is a traditional practice of throwing small unglazed clay discs from a cliff at the temple. If the disc passes through the "Fukuwa" (Ring of Fortune) set on the slope below, it is believed to bring good luck and ward off misfortune. Clay discs are available for purchase at the temple.
Basic Information
| Name | Oyamadera Main Hall (大山寺本堂) |
|---|---|
| Religious Sect | Shingon-shu Daikakuji-ha (真言宗大覚寺派) |
| Mountain Name | Ukozan (雨降山) |
| Temple Founding | 755 (Tenpyo Shoho 7) by Roben Sojo |
| Main Hall Construction | 1885 (Meiji 18) |
| Master Carpenter | Tenaka Myoo Taro (手中明王太郎) |
| Structure | Wooden single-story building, hip-and-gable roof with copper-tile cladding, approx. 248 m² |
| Cultural Property Designation | National Registered Tangible Cultural Property (Building), registered March 6, 2024 |
| Address | 727 Hojusan, Oyama, Isehara, Kanagawa 259-1107, Japan |
| Phone | 0463-95-2011 |
| Access | Odakyu Line to Isehara Station → Bus to Oyama Cable (approx. 25 min) → Walk 15 min → Oyama Cable Car to Oyamadera Station (3 min) → Walk 2 min |
| Official Website | https://oyamadera.jp/ |
References
- 大山寺本堂 - 文化遺産オンライン
- https://bunka.nii.ac.jp/heritages/detail/555311
- 「大山寺本堂」が国の文化財に登録されました。 - 伊勢原市
- https://www.city.isehara.kanagawa.jp/bunkazai/docs/2024040200037/
- 大山寺 本堂 - 伊勢原市
- https://www.city.isehara.kanagawa.jp/bunkazai/docs/2024051300023/
- 本堂 - 雨降山 大山寺公式サイト
- https://oyamadera.jp/other/%E6%9C%AC%E5%A0%82/
- 大山寺 - 伊勢原市（日本遺産）
- https://www.city.isehara.kanagawa.jp/oyama_mairi/heritage/oyamadera/
- 大山寺 (伊勢原市) - Wikipedia
- https://ja.wikipedia.org/wiki/%E5%A4%A7%E5%B1%B1%E5%AF%BA_(%E4%BC%8A%E5%8B%A2%E5%8E%9F%E5%B8%82)
Last verified: 2026.04.11