In a motor driven vehicle in which an electric motor is disposed in a vehicle-body-rear portion of a swing arm swingably supported by a body frame and the vehicle travels by transmitting the drive force of the electric motor to a rear wheel, a vibration generating device for generating vibration in accordance with the transmitted drive force is installed on a drive force transmission path from the electric motor to the rear wheel. The vibration generating device includes a gear pair partially embedded with respective weights to lose a rotational balance during rotation. A sound producing device for producing a predetermined sound in accordance with the transmitted drive force is installed on the same transmission path. The sound producing device is driven by a transmitting device reciprocating through contact with a cam attached to a reduction gear serving as a rotating body.