In 2002, the Archives and Mausolea Department of the Imperial Household Agency provided the mound with the necessary equipment to preserve the Kekkaiseki, and at that time, three parts at the foot of the mound were excavated.
2002年に結界石の保存のため、宮内庁書陵部によって整備され、墳丘すそ部が3カ所発掘された。