It is said that the antiaircraft artillery position was taken up by the former Japanese military during World War II, and the building stones (produced in Shibayama, Kashiwabara City) in the vertical stone chamber were dug up at that time.
第2次世界大戦中には旧日本軍により対空砲の陣地がおかれ、このさいに竪穴式石室の石材（柏原市芝山産）が堀りだされたとされる。