Power unit device of vehicle

A power unit device of a vehicle in which, from a differential device that is arranged on a first vehicle-width-direction side of an engine, a drive shaft is inserted into an oil pan of the engine and extends toward a second vehicle-width-direction side, the power unit device comprising:

• a heat insulating member that covers an outer side of the oil pan;
• and
• a differential housing that houses the differential device and that is fitted to and mounted on the first vehicle-width-direction side of the oil pan, wherein
• a fitting portion that is formed in a cylindrical shape is provided in the differential housing,
• a fitted portion that is formed in a cylindrical shape and to which the fitting portion of the differential housing is fitted is provided in the oil pan, and
• a fitting face portion of one of the fitting portion of the differential housing and the fitted portion of the oil pan comprises, at different positions in a circumferential direction, a plurality of recesses recessed in a 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.