An important investigated example of a burial facility predating standardized keyhole tombs. Sakurai City dates it to the mid-3rd century.
Finds & research
The stone-enclosed wooden chamber yielded pictorial-band deity-and-beast mirrors, an inner-flower mirror, bronze and iron arrowheads, iron swords and agricultural tools, a decorated double-rimmed jar, and small round-bottomed vessels. No triangular-rimmed deity-and-beast mirror was identified.
Two views on the occupant
Archaeological view
An approximately 80m keyhole mound at Hashinaka, Sakurai, built in the mid-3rd century. The rear has at least two tiers and the front one; it is the only Makimuku-type keyhole mound known with stone facing. Its central burial facility is a stone-enclosed wooden chamber holding a boat-shaped coffin. A horizontal chamber was added beside it in a later period.
Imperial Household Agency view
This is not an Imperial Household Agency mausoleum. A component of the National Historic Site Makimuku Kofun Group (designated in 2006 together with Makimuku Ishizuka; Makimuku Yazuka and Katsuyama were added in February 2026).
Field notes
Use the designated viewing area and do not enter protected parts of the mound or chambers.