There is provided a method for manufacturing an electrical wire. The electrical wire includes a rod-like conductor having a shape corresponding to a predetermined wiring route and also having rigidity to enable the rod-like conductor to maintain the shape, and an insulation sheath covering the rod-like conductor. The method includes: preparing a plurality of rod-like preliminary conductors having the rigidity so as to correspond to a plurality of sub routes into which the wiring route is divided; processing at least one of the plurality of preliminary conductors into a shape conforming to the corresponding sub routes; connecting the plurality of preliminary conductors together to form the rod-like conductor; and forming the insulation sheath to cover the rod-like conductor.