Abstract: [Problem to be Solved] The present invention is to provide a power transmission device and a vehicle that can prevent infiltration of oil into a breather chamber while increasing a degree of freedom of a mounting angle of the power transmission device with respect to a vehicle body. [Means to Solve the Problem] A power transmission device 70 is configured to include a gear case 65, a final gear 74 rotatably provided in the gear case 65, an oil collection unit 100 configured to collect oil L scraped up by the final gear 74 in the gear case 65, an oil return flow channel portion 110 that returns the oil L collected by the oil collection unit 100 to a lower part in the gear case 65, and a breather chamber 120 that has a communication portion 125 for communicating with the oil return flow channel portion 110 and an outlet portion 126 that is formed on an upper part of the gear case 65 for communication between inside and outside of the gear case 65.

Abstract: A straddle type electric vehicle comprises a main frame, a motor unit including an electric motor, a battery that supplies power to the motor unit, and a control unit that executes drive control of the motor unit. The main frame includes a left and right pair of portions, and at least a portion of the motor unit is disposed at a position overlapping the main frame in a side view of the vehicle.

Abstract: A straddle type electric vehicle comprises a main frame, a motor unit including an electric motor, a battery that supplies power to the motor unit, and a control unit that executes drive control of the motor unit. The main frame includes a left and right pair of portions, and at least a portion of the motor unit is disposed at a position overlapping the main frame in a side view of the vehicle.