POWER UNIT DEVICE FOR VEHICLE, AND VEHICLE

A power unit device of a vehicle includes a heat insulating member that covers the outer side of an oil pan, and a differential housing that is fitted to and mounted on the oil pan. A fitting portion is provided in the differential housing, and a fitted portion is provided in the oil pan. A fitting face portion of one of the fitting portion of the differential housing and the fitted portion of the oil pan includes, at different positions in the circumferential direction, a plurality of recesses recessed in the radial direction and a plurality of projections protruding in the radial direction, and is fitted to a fitting face portion of the other of the fitting portion of the differential housing and the fitted portion of the oil pan by the plurality of projections.