What Is the Shimoimai Suwa Shrine Yasaka-sha?
The Shimoimai Suwa Shrine Yasaka-sha (下今井諏訪神社八坂社, also written Yasakasha) is a sanctuary built in 1851 that stands on the south side of the Suwa-sha behind the worship hall of Shimoimai Suwa Shrine in Imai, Matsumoto City, Nagano Prefecture, and was registered as a Registered Tangible Cultural Property on October 31, 2022.
It enshrines Susanoo, the storm deity of Japanese myth. The building was once the main sanctuary of a separate Yasaka shrine in Kita-kōchi, one of the four hamlets of lower Imai. When the Suwa, Hachiman and Yasaka shrines were merged in 1915, it was taken down at its old site and rebuilt here. Facing the worship hall, it is the sanctuary on the left, at the south end of the row of three.
At 3.4 square meters it is the smallest of the three, and also the youngest. The date comes from its style and its ridge tag (Munafuda), and it was repaired in 1938. Matsumoto City believes it was built jointly by carpenters from Kiso and local craftsmen.
Why It Was Registered: Late-Edo Design in a Tiny Sanctuary
The Yasaka-sha was registered as a structure that would be difficult to reproduce. Like its neighbors it is a one-bay Nagare-zukuri sanctuary, with two tiers of close-set rafters, round posts for the core and square posts for the porch (Kōhai), a veranda around the building and a raised front platform (Hama-en).
The interior is where it departs. All three sanctuaries divide their core into an inner sanctum (Naijin) and an outer room (Gejin), but the Yasaka-sha gives the outer room a generous share of its small floor.
The Agency for Cultural Affairs also points to the scroll patterns carved on the head tie beams of the core: the spirals look squashed sideways, a sign of a period distinct from both the Suwa-sha and the Hachiman-sha. Matsumoto City rates the Shimoimai Suwa Shrine Yasaka-sha as well preserved and close to its original form. The roof is copper today and was probably laid with wooden shingles (Kokerabuki) at first.
What to Look For: A Carved Dragon and Flattened Spirals
On the front of the Yasaka-sha, a dragon fills the porch transom (Ranma), carved fully in the round rather than cut through a flat board. Compare the three porch transoms along the row and each sanctuary has its own subject and technique: rabbits and waves in openwork on the Suwa-sha, a phoenix in the round on the Hachiman-sha, and this dragon.
The second clue is on the head tie beams. The carved spirals there are flattened into wide, low shapes, quite unlike the scroll patterns on the Suwa-sha built about 100 years earlier. One carved line is enough to show how local carpenters changed their habits of ornament over a century of building the same type of shrine.
This is not the only dragon in the precinct. The kagura hall, built 9 years later in 1860, has one over its front as well, but that one is modeled in lime plaster (Kote-e). A wooden dragon here and a plaster one there: the same subject rendered by two different trades, both on the route in and out.
Visiting the Shimoimai Suwa Shrine Yasaka-sha
The Shimoimai Suwa Shrine Yasaka-sha stands inside the sacred fence, so walk around to the left-hand (south) side of the worship hall and view it across the fence. The interior is not open.
As the smallest of the three, it rewards binoculars or a zoom lens. The dragon is on the porch front, and the flattened spirals are on the head tie beams of the core. Seen at an angle from the south, the carved dragon shows its depth most clearly.
Directions to the shrine and general visiting conditions are covered on the Shimoimai Suwa Shrine page.
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Q&A
- When was the Shimoimai Suwa Shrine Yasaka-sha built?
- In 1851, according to its style and its ridge tag. It was moved to its current site in 1915 and repaired in 1938.
- Where did the Shimoimai Suwa Shrine Yasaka-sha originally stand?
- In Kita-kōchi, a hamlet of lower Imai, as the main sanctuary of its Yasaka shrine. It was moved here when three local shrines were merged in 1915.
- Which deity is enshrined in the Shimoimai Suwa Shrine Yasaka-sha?
- Susanoo, the storm deity of Japanese myth.
- What are the highlights of the Shimoimai Suwa Shrine Yasaka-sha?
- A dragon carved in the round in the porch transom, and flattened spiral patterns on the head tie beams. Its roomy outer chamber is another distinguishing feature.
- Where can I see the Shimoimai Suwa Shrine Yasaka-sha from?
- It stands on the left (south) inside the sacred fence behind the worship hall. View it across the fence from beside the hall; the interior is closed.
Basic Information
| Name | Shimoimai Suwa Shrine Yasaka-sha |
|---|---|
| Location | 2971-2 Harada, Imai, Matsumoto City, Nagano Prefecture |
| Designation | Registered Tangible Cultural Property (Building) |
| Year Designated | 2022 (Reiwa 4), registered |
| Quantity | 1 building |
| Dimensions | Building area 3.4 square meters |
| Owner | Suwa Shrine (religious corporation) |
| Public Access | Exterior viewable from outside the sacred fence (interior closed) |
References
- Agency for Cultural Affairs, Database of National Cultural Properties: Shimoimai Suwa Shrine Yasaka-sha
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00014361
- Matsumoto City: Shimoimai Suwa Shrine (4 buildings), in Japanese
- https://www.city.matsumoto.nagano.jp/soshiki/134/95059.html
Last verified: 2026.09.26
