| Location | Yao, Osaka |
|---|---|
| Shape | Keyhole-shaped mound |
| Mound length | 160 m |
| Period | Early 5th c. |
| Designation | National Historic Site |
An approximately 160m-long keyhole mound in Otake, Yao, and the largest in central Kawachi. Built in the first half of the 5th century, it has three tiers, stone-faced slopes, and rows of cylindrical haniwa on its terraces. A National Historic Site, it is open as an archaeological park following conservation work. Accounts of its name differ: the Yao City Library links it to Shinkoji, a Hata clan temple said to have stood in the area until the Kamakura period, while Osaka Prefecture links it to Shingoji, a temple built west of the mound in the late Asuka period.
Three burial facilities were identified in the rear circle, yielding armor, mirrors, and other objects. A projection produced a haniwa representing a water-ritual setting, with a house and enclosure modelled together.
The historic site has been restored, and visitors can climb to the top of the front section. The adjacent Shionjiyama Kofun Learning Center has an exhibition room. It is about a 20-minute walk north of Kintetsu Hattorigawa Station according to Yao City and Osaka Prefecture (the learning center gives about 25 minutes), or can be reached by bus from Kintetsu Kawachi-Yamamoto Station. The learning center has a paid car park with seven spaces; admission to its exhibition room is ¥240 for adults.
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