A head ornament fastening member that attaches a head ornament to hairs on a head. The head ornament fastening member comprises a first fastening member that includes a base, and a plurality of stems which protrude from a surface of the base and are inserted into the hairs from upside; and a second fastening member that includes a plurality of comb-tooth-like portions which intersect the plurality of stems and are inserted into the hairs from a lateral direction. The plurality of stems of the first fastening member and the plurality of comb-tooth-like portions of the second fastening member intersect with each other in the hairs from upside and a lateral direction, thereby fastening the head ornament to the hairs.