Shijonawate, Osaka Keyhole-shaped mound

Shinobugaoka Kofun

LocationShijonawate, Osaka
ShapeKeyhole-shaped mound
Mound length87 m
PeriodMid-4th c.
DesignationPrefectural Historic Site

Overview

A representative Early Kofun-period keyhole mound of northern Kawachi. It stands within Shinobugaoka Shrine, where the pit chamber can be viewed through its protective shelter.

Finds & research

The 1935 investigation identified jasper arm ornaments, iron weapons, helmet fragments, and other objects.

Official status & archaeological view

Official status
It is an Osaka Prefecture-designated Historic Site, with its pit-style chamber preserved under a shelter beside the main hall of Shinobugaoka Shrine.
Archaeological view
An approximately 87m-long keyhole mound with a rear diameter of about 45m at Okayama 2, Shijonawate. It is thought to date to the mid-4th century. Kyoto University investigated its previously looted pit chamber in 1935, identifying jasper arm ornaments, iron weapons, and helmet fragments. The occupant is unknown.

Field notes

About a ten-minute walk west from JR Shinobugaoka Station. The chamber is normally viewed through the lattice of its shelter; to go inside the shelter, apply to the Shijonawate City Cultural Properties Division at least one month ahead (the chamber itself cannot be entered). Follow shrine and site guidance.

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Sources

四條畷市 忍岡古墳四條畷市 忍岡古墳の築造時期奈良文化財研究所『古墳の特質と整備』(2025)忍岡古墳の石室覆屋四條畷市 史跡 忍岡古墳(碧玉製の腕輪)大阪府 古い写真から見る大阪府の文化財 忍岡古墳の調査

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