The Oldest Building on the Grounds
At Hachiman Shrine in the Yomogita district of Saku, the hall that faces the main approach head-on is neither the largest structure on the grounds nor the most heavily carved. It is the oldest. The Kōra-sha hall was raised in 1491, and for almost three centuries it stood as the shrine's main hall before a newer building took over that role in 1783.
Saku lies in the eastern hills of Nagano Prefecture, along the route of the old Nakasendō, the inland highway that once tied Edo to Kyoto. The shrine sat at Yawata-juku, one of the road's sixty-nine post stations. Daimyō processions, pilgrims, and merchants all passed this way, and the place name Yawata, an old reading of Hachiman, still marks the spot.
The little hall changed jobs but not its address. When the present main hall and worship hall were built in 1783, the original main hall was kept on the grounds and rededicated as the Kōra-sha, a sub-shrine honoring Kōra Tamatare-no-mikoto, a deity that some traditions identify with the legendary minister Takenouchi-no-Sukune. That is how a fifteenth-century building came to survive intact into the present day.
A Lord's Thanks, Built in Wood
The hall is tied to a specific person and a specific debt. It was put up by Shigeno Mitsushige, lord of Mochizuki, who according to local accounts built the Hachiman shrine in gratitude after being granted authority over the Mochizuki imperial pasture. Mochizuki was long known for raising horses for the court, and the surrounding villages looked to this shrine as their head sanctuary.
The shrine's own founding story reaches back much further, to the year 859, when Shigeno Sadahide is said to have established it. By the late Kamakura period it was known to warriors; the medieval chronicle Azuma Kagami records a reference that is generally read as this shrine. What survives in physical form from those long centuries, though, is the hall of 1491.
It became a designated Important Cultural Property on December 22, 1942. Five munafuda, the wooden ridge tablets that record the dates and circumstances of construction and repair, are listed together with the building under the same designation. They are the reason the 1491 date can be stated with confidence rather than estimated from style alone.
What to Look For
The Kōra-sha is built in the sankensha nagare-zukuri style: a three-bay shrine hall whose gabled roof sweeps down much further over the front than the back, producing an asymmetric profile that reads clearly from the side. The roof is finished in kokerabuki, thin overlapping shingles of split wood rather than tile or copper, a covering that suits the building's age and scale.
Look closely at the woodwork where the beams project beyond the columns. The carved kibana nose-pieces and the tabasami supporting brackets under the eaves carry the design vocabulary of the late Muromachi period, and they are the details a specialist would point to first when dating the hall by eye.
One quiet oddity rewards anyone who notices it. The old pilgrim's path used to come in from the west, so the Kōra-sha faces that former approach and therefore squares up to today's main walkway. The current main hall, built later, is oriented to the east instead and sits at an angle to the path. Standing at the center of the grounds, you can read two different eras in the way the two buildings are turned.
The Wider Shrine and the Old Highway
The Kōra-sha shares its grounds with a full set of later structures, each from a datable moment in the Edo period. The mizugaki gate went up in 1708, the present main hall and worship hall in 1783, and the towering zuijin gate, with its guardian figures, in 1843. Smaller halls for the Suwa and Itsukushima deities stand nearby.
In the votive hall hangs a sangaku dedicated in 1780, a tablet on which practitioners of traditional Japanese mathematics displayed a problem and its solution. It is said to be the oldest surviving example in Nagano Prefecture, and it is a reminder that these grounds were a gathering point for the local community, not only a place of worship.
The shrine works well as a stop on a wider tour of the Nakasendō post towns that thread through the Saku basin. The town of Yawata is roughly fifteen minutes by car from Sakudaira Station, which is served by the Hokuriku Shinkansen, making the hall an easy detour for travelers heading between Tokyo and the Japan Sea coast.
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Q&A
- What exactly is the Kōra-sha, and why is it important?
- It is the former main hall of Hachiman Shrine, built in 1491 and later rededicated as a sub-shrine. As a dated late-Muromachi shrine hall surviving in its original form, it was designated an Important Cultural Property in 1942.
- When was it built, and by whom?
- It dates to 1491 (Entoku 3) and is attributed to Shigeno Mitsushige, lord of Mochizuki, who is said to have built the shrine in thanks for control of the Mochizuki imperial pasture.
- Can I see it up close?
- The hall stands in the open within the shrine grounds and can be viewed from the approach at any time. As a designated cultural property it is not entered; appreciate it from the exterior and respect any rope barriers in place.
- What does "sankensha nagare-zukuri" mean?
- It describes a shrine hall three bays wide with a nagare-zukuri roof, the most common Japanese shrine form, in which the front roof slope extends well beyond the back to shelter the entrance.
- What else is worth seeing here?
- The 1843 zuijin gate, the 1783 main hall and worship hall, and a 1780 mathematical votive tablet said to be Nagano's oldest. The shrine also pairs naturally with a walk among the nearby Nakasendō post towns.
Basic Information
| Name | Kōra-sha Main Hall, a sub-shrine within Hachiman Shrine (former Hachiman Shrine main hall) |
|---|---|
| Location | Yomogita 101-1, Saku City, Nagano Prefecture |
| Owner | Hachiman Shrine |
| Designation | Important Cultural Property (buildings), designated December 22, 1942 |
| Date | Entoku 3 (1491), late Muromachi period |
| Structure | Three-bay nagare-zukuri, kokerabuki (wood-shingle) roof; one building |
| Additional designation | Five munafuda (ridge tablets) |
| Access | About 15 minutes by car from Sakudaira Station (Hokuriku Shinkansen) |
| Viewing | Exterior viewing within the shrine grounds; interior not open |
References
- National Database of Designated Cultural Properties (Agency for Cultural Affairs)
- https://kunishitei.bunka.go.jp/bsys/maindetails/102/976
- Cultural Heritage Online (Agency for Cultural Affairs)
- https://bunka.nii.ac.jp/heritages/detail/185126
- Hachiman Shrine and Kōra-sha (Saku City official site)
- https://www.city.saku.nagano.jp/kanko/kanko/townguide/temp/yawata.html
- Hachiman Shrine (Saku Regional Union tourism site)
- https://www.areasaku.or.jp/kankou/spot/21636.html
Last verified: 2026.06.04