A drive device for a vehicle, comprising: a first drive shaft and a second drive shaft whose axial ends are caused to oppose each other so as to be coaxially arranged; a differential mechanism that has a first sun gear which is connected to the first drive shaft, a second sun gear which is connected to the second drive shaft, a first pinion gear which meshes with the first sun gear, a second pinion gear which meshes with the second sun gear and the first pinion gear, and a carrier which rotatably supports the first pinion gear and the second pinion gear; a speed reduction mechanism that has an input sun gear which is connected to an input shaft, a first speed reduction pinion gear which meshes with the input sun gear and is rotatably supported by the carrier, a second speed reduction pinion gear which is connected to the first speed reduction pinion gear and is rotatably supported by the carrier, and a ring gear which meshes with the second speed reduction pinion gear; and a case that encloses the differential mechanism and the speed reduction mechanism which are coaxially arranged, that rotatably supports the carrier, and to which the ring gear is fixed, characterized in that the second speed reduction pinion gear of the speed reduction mechanism, and the first pinion gear and the second pinion gear of the differential mechanism are arranged out of phase in a rotation direction, and the second speed reduction pinion gear of the speed reduction mechanism, and the first pinion gear and the second pinion gear of the differential mechanism are arranged at a position in an axial direction so that at least any one of the first pinion gear and the second pinion gear of the differential mechanism overlaps with the second speed reduction pinion gear of the speed reduction mechanism. a first drive shaft and a second drive shaft whose axial ends are caused to oppose each other so as to be coaxially arranged; a differential mechanism that has a first sun gear which is connected to the first drive shaft, a second sun gear which is connected to the second drive shaft, a first pinion gear which meshes with the first sun gear, a second pinion gear which meshes with the second sun gear and the first pinion gear, and a carrier which rotatably supports the first pinion gear and the second pinion gear; a speed reduction mechanism that has an input sun gear which is connected to an input shaft, a first speed reduction pinion gear which meshes with the input sun gear and is rotatably supported by the carrier, a second speed reduction pinion gear which is connected to the first speed reduction pinion gear and is rotatably supported by the carrier, and a ring gear which meshes with the second speed reduction pinion gear; and a case that encloses the differential mechanism and the speed reduction mechanism which are coaxially arranged, that rotatably supports the carrier, and to which the ring gear is fixed, characterized in that the second speed reduction pinion gear of the speed reduction mechanism, and the first pinion gear and the second pinion gear of the differential mechanism are arranged out of phase in a rotation direction, and the second speed reduction pinion gear of the speed reduction mechanism, and the first pinion gear and the second pinion gear of the differential mechanism are arranged at a position in an axial direction so that at least any one of the first pinion gear and the second pinion gear of the differential mechanism overlaps with the second speed reduction pinion gear of the speed reduction mechanism.