A drive device for vehicles includes a transmission device including a transmission mechanism that changes a speed of inputted rotation of a drive source of a vehicle and outputs the rotation and that is provided on an axis of rotation orthogonal to a front-rear direction of the vehicle; and a casing that holds the transmission mechanism; and a control device that performs electronic control of the transmission device, at least a part of the control device being installed on an outside of the casing, and the control device is installed at either one of a front side portion and a rear side portion of the casing in the front-rear direction of the vehicle.