Because these have also been excavated from the ancient capital sites like Fujiwara-kyo (the Imperial capital of Japan for sixteen years between 694 and 710) in Nara Prefecture and the ruins in the Kinki region, these kiln sites seem to have been functioning as the official kilns as well.
これらは藤原京など奈良県内にある古代の都跡や近畿地方の遺跡などからも出土しており、官窯の役割も果たしていたようである。