 is a Shinto shrine in Ōmachi, Nagano Prefecture, Japan. The shrine is the oldest extant example of "shinmei-zukuri", one of three architectural styles which were conceived before the arrival of Buddhism in Japan. It predates in fact the more famous Ise Shrine, which shares the style and has been since antiquity rebuilt every twenty years. It was ranked as a Prefectural Shrine under the Modern system of ranked Shinto shrines.
This style is characterized by an extreme simplicity. Its basic features can be seen in Japanese architecture from the Kofun period (250–538 C.E.) onwards and it is considered the pinnacle of Japanese traditional architecture. It is most common in Mie prefecture. Built in planed, unfinished wood, the "honden" is either 3x2 "ken" or 1x1"ken" in size, has a raised floor, a gabled roof with an entry on one the non-gabled sides (), no upward curve at the eaves, and purely decorative logs called "chigi" (vertical) and "katsuogi" (horizontal) protruding from the roof's ridge.
Two of its structures, the and the , are listed as National Treasures of Japan.
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