From 1997 to the next year the Kashihara Archaeological Institute, Nara Prefecture conducted the third excavation research and discovered 33 Sankaku Shinju-kyo Mirrors and one Gamontai Shinju-kyo Mirror (Mirror with figures of deities and sacred animals) in almost the same state when they were buried.
1997年（平成9年）から翌年にかけて奈良県立橿原考古学研究所が行った第3次発掘調査で、三角縁神獣鏡33面と画文帯神獣鏡1面が、副葬当時に近い状態で発見された。