An object is to provide a wire harness capable of protecting a wire, and also capable of facilitating the mounting of the wire and a soundproofing material to a place where soundproofing (e.g., sound absorption or sound insulation) is required. The wire harness includes a wire and a soundproofing sheet. The soundproofing sheet includes a sheet-like soundproofing material that is combined integrally with the wire along the wire. A plurality of holes are formed in the soundproofing sheet at positions along a route of the wire.