It has been handed down that the poles were made of copper, which were left after casting of the statue of Birushana Buddha in Todai-ji Temple, but the existing poles were rebuilt during the Muromachi Period.
東大寺盧舎那仏像を鋳造した際の余りの銅で造ったという伝承があるが、現存するものは室町時代の再興である。