POWER TRANSMISSION DEVICE

[Problem] To increase a lubrication amount. [0002] [Solution] This power transmission device comprises: a first drive shaft; a second drive shaft; a differential mechanism that is connected to the first drive shaft and the second drive shaft; a case that accommodates the differential mechanism, and that has an oil hole; a pinion shaft that is supported by the case; a pinion gear that has the pinion shaft as an axial center; and a bearing that is positioned between the pinion shaft and the pinion gear, and that is lubricated via the oil hole which opens toward the outside of the case.