WIRE HARNESS ARRANGEMENT STRUCTURE

A wire harness arrangement structure includes a silencer, the wire harness, and a cover. The silencer includes a silencer body with a groove recessed in a thickness direction is formed in a main surface of the silencer body. The groove houses at least part of the wire harness. The cover includes a pair of legs covering both lateral sides of the wire harness housed in the groove and a lid covering an upper side of the wire harness housed in the groove and coupling the pair of legs together, and is open at a bottom side of the groove.