Shikinzan Kofun, Keyhole-shaped burial mound in Ibaraki, Osaka Prefecture, Japan

Shikinzan Kofun is a keyhole-shaped mound in Ibaraki, Osaka Prefecture, built eastward along a mountain ridge. It measures about 110 m long, with a rear circular section roughly 76 m across and a front section about 40 m wide at its end. A vertical stone chamber, lined with flat andesite and schist slabs and capped by seven granite ceiling stones, lies in the rear mound.

Shikinzan Kofun is a keyhole-shaped mound in Ibaraki, Osaka Prefecture, built on a mountain ridge and facing east. Its stone chamber was exposed in 1947 during construction of a hospital facility on the hilltop, and Kyoto University and Osaka Prefecture excavated it that May. Surveys from 1992 to 2004 confirmed a mound length of about 110 m.

Excavations at Shikinzan Kofun yielded many cylindrical haniwa, including finned cylindrical forms with wing-like projections compared to those from Matsukayama Kofun in Osaka Prefecture. The tomb mound's slopes were faced with hornfels, sandstone and granite cobbles gathered from the beds of the nearby Katsuoji and Ibaraki rivers.

The mound lies in Ibaraki, Osaka Prefecture, not Ibaraki Prefecture. From JR Ibaraki Station take the Hankyu Bus bound for Ibaraki Sunytown and get off at Fukui, then walk about 18 minutes. The site is an Osaka Prefecture designated historic site, designated on 29 January 2002.

Excavations uncovered jewelry and ceremonial weapons indicating the high status of the deceased. These objects reveal how important craftsmanship and artistic skill were in that ancient society.