POWER TRANSMISSION DEVICE

[Problem] To reduce the size of a power transmission device. [0002] [Solution] This power transmission device has: a bearing; a differential mechanism; a case accommodating the differential mechanism; a pinion gear supported on the case; a wall part axially overlapping with the case; a plate which is disposed between the wall part and the case in the axial direction and supports the case with the bearing therebetween; and a parking pole rotatably fixed to the plate at a position axially overlapping with the plate.