In 1953, in the wake of the discovery of Shibi (ornamental ridge-end tile) in the vicinity of the location where the roof tiles were found, excavation and study by Naniwakyushi Kenshokai (Association of honoring publicly for Naniwa Palace site) got underway.
昭和28年、同地付近から鴟尾（しび）が発見されたのがきっかけで、難波宮址顕彰会の発掘・調査が進んだ。