POWER TRANSMISSION DEVICE AND DRIVE DEVICE

A power transmission device includes a housing having a first chamber and a second chamber, a left gear unit accommodated in the first chamber and having a first rotation shaft, and a right gear unit accommodated in the second chamber and having a second rotation shaft located coaxially with the first rotation shaft. The housing has a center housing located between the first chamber and the second chamber. The center housing has a flat plate portion, a first bearing support portion supporting a first bearing located at a first end of the first rotation shaft, and a second bearing support portion supporting a second bearing located at a first end of the second rotation shaft. The flat plate portion is provided with a gap in at least a part of an annular region located between the first bearing support portion and the second bearing support portion.