Tsuzumi, which is used in accompanying music for 
nogaku and 
kabuki, is a type of hand drum with sandglass-shaped body. 
Tsuzumi used in 
nogaku, including smaller size 
kotsuzumi and larger size 
otsuzumi, is said to have developed from 
tsuzumi used in 
gagaku. As the shape of 
nogaku tsuzumi is different from that of 
gagaku tsuzumi in details, the author supposed that there were some transitional types. Conducting a study of ancient musical instruments owned by temples and museums throughout the country, the author discovered several transitional 
tsuzumi. This paper shows how the shape of 
tsuzumi changed from that used in 
gagaku to that used in 
nogaku.
Three names have normally been used to distinguish 
tsuzumi used in 
gagaku: ikko, the smallest; 
ni-no-tsuzumi, the medium sized; 
san-no-tsuzumi, the biggest. But as a result of investigation, it was found that the shape and size of 
tsuzumi bodies were not standardized, as was understood until now, and that there was a gradual transformation. For instance, bowl-shaped parts of the body became narrower, thus resembling 
tsuzumi used in 
nogaku.
In the course of investigation, several black-lacquered 
tsuzumi were discovered at Araki Shrine, Isonokami Shrine, Taji Shrine, and Kandani Shrine. Compared with 
tsuzumi used in gagaku, they are not decorated with imaginary flowers and their two bowl-shaped parts are decorated with three carved lines instead of double-strand bands. Without the lines carved on the bodies, they would look like 
tsuzumi used in 
nogaku. In addition, almost all of them have very similar bodies, as if they were standardized. These discoveries coincide with the tradition which says that the size and shape were determined by craftsmen in the Tonomine District during the Kamakura Period. However, there are differences in the way the inside of the body is carved. For example, the 
tsuzumi of Isonokami Shrine is closer to 
gagaku tsuzumi, while those of Taji and Kandani Shrine are closer to 
nogaku tsuzumi. These 
tsuzumi seem to have been used in 
gagaku or medieval performing arts other than 
nogaku. Two 
tsuzumi of Araki Shrine seem to have been used in 
gagaku, for the Araki area was a territory of a 
gagaku musician, Ohno Yoshikata, in the Kamakura Period. Four 
tsuzumi are said to have been used in a festival at Isonokami Shrine. At Taji Shrine, four 
tsuzumi are used in a dance called “Kakko-suri” which has been continued since the Muromachi Period. The 
tsuzumi of the Kandani Shrine, whose interior was carved for tuning, was perhaps used in 
nogaku or medieval performing arts.
Another 
tsuzumi, more similar to 
tsuzumi used in 
nogaku, was discovered at Nunakuma Shrine. Three carved lines remain on the body, but the body is decorated with 
makie just like a 
nogaku tsuzumi. This is by tradition the work of Chigusa, an early craftsman of masks and instruments. It is clear that this 
tsuzumi was first coated with black lacquer and used to accompany some medieval performing art. 
Makie was later applied when the 
tsuzumi began to be used in 
nogaku. This 
tsuzumi is the very missing-rink that connects 
gagaku, medieval performing arts and 
nogaku.
Another interesting fact about this 
tsuzumi discovered at Nunakuma Shrine is that its size is that of 
kotsuzumi even though it has the shape of 
otsuzumi. According to a catalogue of 
nogaku-players called “Yoza Yakusya Mokuroku”, 
kotsuzumi player, Ko Gorojiro, transformed 
otsuzumi into 
kotsuzumi. In addition, the discovery of the 
tsuzumi of Nunakuma Shrine suggests that the shape of 
kotsuzumi
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