Abstract: The present invention provides a device to support an outboard boat motor mounted on a boat during trailering of the boat and motor over the road, comprising an elongate support shaft adjustable in length, a U-shaped foot connected to one end of the support shaft, and a transverse engagement rod and bracket connected to the opposite end of the support shaft. The support device of the invention is designed to be disposed between the outboard motor and the boat trailer upon which the boat is positioned, with the U-shaped foot in engagement with the trailer and the transverse rod and bracket in engagement with the mounting bracket through which the outboard boat motor is pivotally interconnected to the transom of the boat, supporting the motor in an elevated position without imposing excessive stress on either the motor housing or the transom of the boat.