Provided is an exterior body for an electrical wire, with which it is possible to prevent anisotropy of mechanical characteristics, enhance the degree of freedom of design, and form a small exterior body for an electrical wire. An exterior body for an electrical wire to be mounted on the outer circumference of the electrical wire, wherein the exterior body for an electrical wire is formed by folding a thermoplastic resin foam sheet having a density of 200 Kg/m<3> to 700 Kg/m<3>.