Shinohara Shrine Main Hall, a Shrine Within the Grounds of

A 1427 Shrine Hall Beside a National Treasure

Inside the roof cavity of a small shrine in the Ōshinohara district of Yasu, Shiga Prefecture, an ink inscription records the year Ōei 34, which corresponds to 1427. That single line of writing fixes the age of the Main Hall of Shinohara Shrine, a compact auxiliary shrine that sits just to the left of Ōsasahara Shrine's much larger main hall. The two buildings face the same way and share one quiet wooded clearing, yet they belong to different ranks: the larger one is a National Treasure, and the smaller one beside it carries the title of Important Cultural Property.

Shinohara Shrine is dedicated to Ishikoridome-no-mikoto. In the old creation accounts she is the deity who cast the sacred bronze mirror used to lure the sun goddess Amaterasu out of her cave, and she is remembered as the ancestral patron of mirror makers. The choice of deity matters here, because the shrine has long gone by a second, friendlier name.

The "Rice-Cake Shrine"

Local people call the building Mochi-no-miya, the Rice-Cake Shrine. The district around it once grew a sticky strain of rice known as Shinohara mochi, and the area is remembered as a birthplace of kagami-mochi, the stacked rounds of pounded rice set out at New Year. The name kagami-mochi literally means "mirror rice cake," because the flat, round shape echoes the polished bronze mirrors of antiquity. A shrine to the mirror-casting goddess standing in rice country famous for round mochi is a coincidence the village was happy to keep.

Shinohara itself was a working place long before it was a quiet one. It functioned as a post station on the Tōsandō, the inland highway later reworked as the Nakasendō, and travelers bought its mochi as a portable, keepable food. The reputation outlasted the road traffic.

Why It Is an Important Cultural Property

The hall was designated on 19 January 1931. It is built in a form recorded as ikkensha sumiki-iri kasuga-zukuri, with a cypress-bark roof. Each of those terms describes something a visitor can actually see. Kasuga-zukuri is a small shrine type that takes its name from Kasuga Taisha in Nara: a single room set on a high platform, with a steep gabled roof curving forward over a short entrance canopy. Ikkensha means the front has a single bay, so the building is genuinely small. Sumiki-iri refers to the diagonal corner rafters tucked under the eaves, a refinement that lifts a plain Kasuga form toward something more carefully made.

What gives the date authority is the munafuda, a wooden ridge tag inscribed when the building was raised. The tag, carrying the Ōei 34 reading, is itself listed as an attached property within the designation. Documentary evidence of this kind is unusual for a building this small, and it is part of why the hall earns national listing rather than a local one. Some sources give the year as Ōei 32 (1425); the dated inscription preserved in the roof is the reason most authorities, including the national database, settle on 1427.

What to Look For

Read the two halls together. The National Treasure beside it, the Main Hall of Ōsasahara Shrine, was rebuilt in 1414 by Mabuchi Sadanobu, lord of nearby Iwakura Castle, only a little over a decade before Shinohara Shrine went up. It is a three-bay irimoya-roofed hall celebrated for dense, virtuoso carving across its transoms, side panels, and bracket zone. Set the small Kasuga hall next to it and the contrast is the point: one building shows late-medieval shrine carpentry at its most ornate, the other shows the same era working at modest scale in an older, restrained shrine form.

Look at the roofline. Cypress-bark roofing is laid in thin overlapping strips that give a soft, slightly furred edge very different from tile, and the forward curve of the Kasuga gable is best seen from a slight angle rather than head-on.

One practical note: worship at this shrine is normally made from the haiden, the prayer hall set a short distance in front, so the finest carved detail on the main hall is admired across a gap rather than at arm's length. Bring patience and, if you have one, a modest zoom.

Around the Shrine

The precinct holds more than its two famous halls. To the right of the prayer hall lies Yorube-no-ike, a pond so deep it is locally described as bottomless. The story attached to it tells of a drought broken after two portable shrines were sunk into the water as an offering, and the pond is said never to have run dry since. Tale aside, the dark still water gives the clearing its particular mood.

Because the main hall is a National Treasure, the shrine was fitted some years ago with an automatic water-spray fire-suppression system, a reminder of how seriously these timber buildings are guarded.

The shrine sits in farmland below the northwest foot of Mount Kagami. The walk in from the bus stop runs through rice fields, which is pleasant in autumn when the surrounding trees turn. There is no admission gate and no fee; this is a living local shrine rather than a managed attraction, so visitors are asked to keep voices low and to respect any ropes or barriers around the halls.