Now, the remains of Shigaraki no Miya Palace has been excavated, and as a result, it was considered that the Palace was located in a place today known as the Miyamachi site in Oaza-Kinose, Shigaraki-cho, and the ruins of the Shigaraki no Miya Palace designated as a historical spot was determinately the site of Koga-ji Temple.
現在、紫香楽宮の遺跡は発掘をうけており、その結果、現在の信楽町大字黄瀬の宮町遺跡として知られるところに宮があって、史跡にも指定されている紫香楽宮址こそが、甲賀寺の跡であろう、と確定的に見られている。