Found in October 1986 in the Hiromine tomb No. 15 (ancient burial mound which is square at the front and rounded in the rear), located in the hilly area to the south of Fukuchiyama Station.
1986年（昭和61年）10月に福知山駅南の丘陵地に位置する、広峯15号墳（前方後円墳）より出土した。