The largest keyhole mound in northern Kawachi (120m). Dating to the early 4th century—among the oldest large kofun in Osaka Prefecture—it strongly retains early Kofun-period characteristics. The splayed "bachi-shaped" front section is the defining feature of early-phase kofun. A vertical stone chamber is believed to occupy the summit of the rear circle; iron implements and bronze mirrors have been found. Located in the Kuzuha district of Hirakata City and protected as a National Historic Site. As the place name "Kinno" (Forbidden Field) suggests, the Kuzuha hill was closely tied to the ancient court. Hirakata is near the ancient transportation hub "Katano," linking the Yodo River waterways with overland routes. The name "Kurumaduka" may derive from a tradition of wheel-shaped haniwa buried here. Scattered early kofun in the surrounding area constitute the "Kuzuha kofun group."
Finds & research
Hirakata City and Osaka Prefecture excavations have partially confirmed a vertical-shaft stone chamber at the rear circle summit, plus stone paving and haniwa. Iron implements and a small number of bronze mirrors have been recorded among the finds. The splayed (bachi-shaped) front section and multi-tiered construction have been confirmed. National Historic Site (designated 1952).
Two views on the occupant
Archaeological view
Occupant unknown. One of the oldest large keyhole mounds in Osaka Prefecture, dated to the early 4th century. 120m long, rear circle ~70m diameter and ~11m high, front section ~52m wide with a distinctive splayed (bachi) profile. The "bachi-shaped front section" is characteristic of early-period kofun, resembling the splayed end of a shamisen plectrum. A vertical stone chamber is believed to occupy the summit of the rear circle; iron weapons and bronze mirrors have been recorded among the finds. The early-4th-century date places this mound at the stage when the Yamato polity was establishing the initial kofun order. It is presumed to have served as the burial site of the paramount chief of northern Kawachi.
Imperial Household Agency view
Not managed by the IHA. National Historic Site administered by Hirakata City. Not designated as an imperial or reference site, enabling archaeological excavation. Designated a National Historic Site in 1952. The place name "Kinno" (Forbidden Field) is said to derive from an ancient imperial preserve belonging to the court, suggesting the mound's location was closely linked to early royal territory.
Field notes
Viewing is possible only from the perimeter (restricted access as a National Historic Site).