A wire harness routing method comprising: preparing a gutter-like protector base whose an upper face is open, and routing a wire harness (W) inside the protector base so as to extend in a longitudinal direction of the protector base ; winding a wire harness-protective tape around an outer periphery of the wire harness (W) at a position outside an end portion of the protector base in the longitudinal direction; putting, in a state that the wire harness-protective tape has been wound around the outer periphery of the wire harness (W), a cover on the protector base so as to cover the open upper face of the protector base ; and characterized by fixing, by a fixing unit , at a position where the tape is wound, the wire harness (W) to a wire harness-fixed protruding piece protruding outward in the longitudinal direction from an end portion of the cover in the longitudinal direction, wherein the wire harness-fixed protruding piece has an L-shaped cross section when viewed from the front in the longitudinal direction of the cover , and includes a protruding piece upper wall flush with the upper wall of the cover 20 and a protruding piece side wall parallel to the side wall of the cover , wherein the protruding piece side wall is provided at a position inside the side wall of the cover , wherein a recessed portion for positioning the fixing unit is provided at a lower end edge of the protruding piece side wall , and wherein the wire harness (W) is accommodated in an inner corner space of the protruding piece and the wire harness (W) is fixed to the wire harness-fixed protruding piece on the cover side. preparing a gutter-like protector base whose an upper face is open, and routing a wire harness (W) inside the protector base so as to extend in a longitudinal direction of the protector base ; winding a wire harness-protective tape around an outer periphery of the wire harness (W) at a position outside an end portion of the protector base in the longitudinal direction; putting, in a state that the wire harness-protective tape has been wound around the outer periphery of the wire harness (W), a cover on the protector base so as to cover the open upper face of the protector base ; and characterized by fixing, by a fixing unit , at a position where the tape is wound, the wire harness (W) to a wire harness-fixed protruding piece protruding outward in the longitudinal direction from an end portion of the cover in the longitudinal direction, wherein the wire harness-fixed protruding piece has an L-shaped cross section when viewed from the front in the longitudinal direction of the cover , and includes a protruding piece upper wall flush with the upper wall of the cover 20 and a protruding piece side wall parallel to the side wall of the cover , wherein the protruding piece side wall is provided at a position inside the side wall of the cover , wherein a recessed portion for positioning the fixing unit is provided at a lower end edge of the protruding piece side wall , and wherein the wire harness (W) is accommodated in an inner corner space of the protruding piece and the wire harness (W) is fixed to the wire harness-fixed protruding piece on the cover side. <EOS>