Yadani Kofun (矢谷古墳) is a Yayoi period burial mound, located in the Higashisakaya neighborhood of the city of Miyoshi, Hiroshima in the San'yō region of Japan.

Yatani Tumulus is built on a low hill on the south side of the Basen River, which flows into the Miyoshi Basin from the east.

The yosumi-tosshutsugata style is unique to the late middle Yayoi period and is most prevalent in western Japan in areas influenced by the Izumo culture.

[2] A large number of red-lacquered vessel stands and Yayoi pottery have been excavated from the eastern part of the mound and the surrounding moat.

These artifacts have been collectively designated a National Important Cultural Property and are stored in the Hiroshima Prefectural Museum of History and Folklore.