A hybrid electric vehicle comprising: an internal combustion engine; a generator that is mechanically connected with the internal combustion engine with a gearbox interposed therebetween; a motor-generator that is mechanically connected with drive wheels with the gearbox interposed therebetween; and an inverter that is electrically connected with the generator and the motor-generator, wherein the internal combustion engine, the gearbox and the generator are fastened one another, in this order, along an axial direction of a rotary shaft of the generator, wherein the motor-generator is fastened to the gearbox and located at a rear side of the generator, wherein the inverter housing of the inverter is fixed with an MG housing of the motor-generator, wherein the inverter and the generator are electrically connected with each other by a wiring harness, wherein a generator opening thorough which one end of the wiring harness is inserted is formed on a generator housing of the generator, wherein a portion of an inverter housing of the inverter, which is closest to the internal combustion engine and farthest from the motor-generator, protrudes outward, and another end of the wiring harness is inserted through an inverter opening that is formed on an outer surface of the protruding portion of the inverter housing so as to be closest to the internal combustion engine and farthest from the motor-generator, wherein a lead-out direction of the one end of the wiring harness from the inverter opening is a first direction toward the generator, wherein a lead-out direction of the other end of the wiring harness from the generator opening is a second direction that is different from the first direction (D 1), wherein the inverter opening and the generator opening are opened toward the internal combustion engine and the inverter opening is set off with respect to the generator opening in the second direction, wherein at least a portion of the wiring harness extends between the generator housing and the inverter housing, wherein the second direction is parallel to the axial direction, wherein the generator opening is opened on a terminal box that is formed on the generator housing and protrudes toward the inverter, and wherein the terminal box is located at a position on the generator housing that is on a farthest side from the inverter opening along the axial direction. an internal combustion engine; a generator that is mechanically connected with the internal combustion engine with a gearbox interposed therebetween; a motor-generator that is mechanically connected with drive wheels with the gearbox interposed therebetween; and an inverter that is electrically connected with the generator and the motor-generator, wherein the internal combustion engine, the gearbox and the generator are fastened one another, in this order, along an axial direction of a rotary shaft of the generator, wherein the motor-generator is fastened to the gearbox and located at a rear side of the generator, wherein the inverter housing of the inverter is fixed with an MG housing of the motor-generator, wherein the inverter and the generator are electrically connected with each other by a wiring harness, wherein a generator opening thorough which one end of the wiring harness is inserted is formed on a generator housing of the generator, wherein a portion of an inverter housing of the inverter, which is closest to the internal combustion engine and farthest from the motor-generator, protrudes outward, and another end of the wiring harness is inserted through an inverter opening that is formed on an outer surface of the protruding portion of the inverter housing so as to be closest to the internal combustion engine and farthest from the motor-generator, wherein a lead-out direction of the one end of the wiring harness from the inverter opening is a first direction toward the generator, wherein a lead-out direction of the other end of the wiring harness from the generator opening is a second direction that is different from the first direction (D 1), wherein the inverter opening and the generator opening are opened toward the internal combustion engine and the inverter opening is set off with respect to the generator opening in the second direction, wherein at least a portion of the wiring harness extends between the generator housing and the inverter housing, wherein the second direction is parallel to the axial direction, wherein the generator opening is opened on a terminal box that is formed on the generator housing and protrudes toward the inverter, and wherein the terminal box is located at a position on the generator housing that is on a farthest side from the inverter opening along the axial direction.