Abstract: A drive unit may include a case comprising an electric motor chamber and a gear chamber; an electric motor comprising a rotor housed in the electric motor chamber; a specific gear housed in the gear chamber; lubricant stored in the electric motor chamber and the gear chamber; and a through hole connecting the electric motor chamber and the gear chamber. An opening of the through hole on a gear chamber side may be positioned so as to face a side surface of the specific gear. A region below a center of the specific gear is defined as a lower region, a part of the lower region that is located rearward of a vertical plane passing through a center axis of the specific gear in a rotation direction of the specific gear is defined as a lower rear region, and the opening may be in the lower rear region.

Abstract: A sleeve is covered on an outer peripheral surface of a shaft shaped part formed integrally with a support wall fixed to a casing of a transmission, to which sleeve a pair of seal rings are fitted putting a circumferential oil groove therebetween. A groove continuously formed in the outer peripheral surface and the tip end surface of the shaft shaped part is covered with the sleeve to form an oil passage structure. Part of oil supplied from an oil passage penetrating a main shaft to a discharge space for lubricating a bearing located at the tip end of the shaft shaped part flows into the oil passage structure and is further transferred to a space between the support wall and a clutch drum to lubricate the seal ring located on the side of the support wall from the outside.