An electric transaxle unit includes an axle, an electric motor for driving the axle, a motor shaft serving as an output shaft of the electric motor, the motor shaft being not coaxial to the axle, a deceleration gear train interposed between the motor shaft and the axle, a brake adapted to brake any element in a power train between the motor shaft and the axle via the deceleration gear train, and a casing. The casing incorporates the axle, the electric motor, the motor shaft, the deceleration gear train and the brake. The casing includes an attachment portion to be attached to a frame, and wherein the attachment portion has a constant height from a center axis of the axle regardless of whether the casing is vertically inversed.