This keyhole-shaped tumulus from the second half of the early Kofun period (late 4th century) is 190m long and 129m long at the rear, making it the second largest keyhole-shaped tumulus on the Sea of Japan coast after Amino Choshiyama Tumulus. It is a nationally designated historic site. It is built in three tiers with roofing stones and a row of Tango-style cylindrical haniwa clay figures, and stones are scattered at the top, suggesting that a pit-type stone chamber may have been built there. It is believed to be the tomb of a powerful clan that ruled the Tango region, and excavated items are on display at the nearby Ancient Village Museum.

(A shortcut to Shinmeiyama Kofun starts from the side of Takeno Shrine. Climb the steps on the edge of the hill and follow the signs through the houses to reach the front part of the Myojinyama historic site, about 250m from Takeno Shrine. In the center there is a monument marking the historic site.)