A keyhole mound in the Hiokayama group, within Hiokayama Park, Kakogawa. Managed by the IHA as the Hi-no-Oka Mausoleum of Harima-no-Inabi-no-Oiratsume, it has a worship area reached through the park.
Finds & research
Burial facility and occupant unconfirmed. The IHA mound-shape survey collected three haniwa fragments and one pottery fragment from the mound surface.
Official status & archaeological view
Official status
The IHA manages the site as the Hi-no-Oka Mausoleum of Harima-no-Inabi-no-Oiratsume, empress of Emperor Keiko.
Attribution (jitei): the Imperial Household Agency's determination of whose tomb it manages — separate from heritage designation.
Archaeological view
Kakogawa City describes a keyhole mound about 85m long, thought to date to the 4th century. Its burial facility and occupant have not been established. The IHA Archives and Mausolea Department's 2012 mound-shape survey gives a present length of about 80m based on its measurements (about 82m in the report's introduction).
Field notes
About 10 min on foot from Hioka Station on the JR Kakogawa Line to Hiokayama Park, according to Kakogawa City. Worship is from the oratory; the mound itself is closed.