What katsuogi are
Katsuogi are short round billets laid across the ridge of a shrine hall at even intervals. The Japanese name is said to derive from their resemblance to dried bonito.
Records name them with the Chigi. The main hall of Kameoka Shrine in Nagasaki Prefecture, built in 1880, is described as three bays by two, Kirizuma-zukuri and entered from the eaves side, roofed in sheet metal, with a veranda round the front and sides and finials and billets on the ridge.
Sometimes they are counted. The main hall of Oka Shrine in Shiga Prefecture, from the early Meiji period, has a Hiwadabuki roof with finials and seven billets on the ridge. The number varies from hall to hall and is recorded as a fact about the building.
The hall at Tomobayashi Shrine in Osaka Prefecture, built in 1940, is described as a single-bay hall in Shinmei-zukuri under copper sheet with finials, billets and the horizontal braces set outside the gable.
A note on the written form
The records of the Agency for Cultural Affairs write the Japanese name with two different sets of characters, and a third form also circulates. All are read the same and mean the same thing.
Searching under only one form misses examples. When quoting, keep the form used by the entry.
On site, look along the ridge from the side. Short logs lying across it at even intervals are the billets; the members projecting diagonally and crossing at the ends of the ridge are the finials. The two differ in both position and direction.
Both belong to shrine halls and are not used on Buddhist buildings, which makes them useful for identifying a building from a distance.
References
- Agency for Cultural Affairs: National Treasures and Important Cultural Properties (structures)
- https://www.bunka.go.jp/seisaku/bunkazai/shokai/yukei_kenzobutsu/kokuho_bunkazai.html
- National Cultural Properties Database: Kameoka Shrine Main Hall, gabled and eaves-entered, its ridge carrying crossed finials and billets
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00009404
- National Cultural Properties Database: Oka Shrine Main Hall, a shinmei-zukuri hall with free-standing ridge posts and seven billets
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00003249
- National Cultural Properties Database: Tomobayashi Shrine hall, with crossed finials, billets and upright ridge posts
- https://kunishitei.bunka.go.jp/bsys/maindetails/101/00014272
Last verified: 2026.09.10