Built after Kutsukawa Kurumazuka, this is the last large keyhole mound in the Kutsukawa group and is interpreted as the tomb of the next regional paramount chief.
Finds & research
A clay burial facility was identified in the rear mound, and cylindrical and figurative haniwa lined the mound. Details of the grave assemblage are limited.
Official status & archaeological view
Official status
It became a Joyo City Historic Site in 1987 and a component of the National Historic Site Kutsukawa Kofun Group on 3 October 2016.
Archaeological view
A two-tiered keyhole mound at Hirakawa Chayaura, Joyo, 114m long and 161m including its moat. Built in the mid-5th century, it has stone facing, haniwa rows, and a moat; a clay burial facility was identified in the rear mound.
Field notes
The mound is private property and cannot be entered; view it from surrounding roads.