Power from an engine of a hybrid vehicle is input to an input shaft (302) of a power split device. A one-way clutch (500) and the power split device are housed in a housing (600). A cover member (700) is provided inside the housing (600). The one-way clutch (500) includes an outer race (510), an inner race (520), and a sprag (530). The outer race (510) is spline-engaged to a protruding portion (701) of the cover member (700). The inner race (520) is spline-engaged to the input shaft (302), and is rotatably supported by the protruding portion (702) of the cover member (700) via a bushing (522). The input shaft (302) is rotatably supported by the cover member (700) via a first bearing (340), a rotating member (322A), and a second bearing (350).