Abstract: The device prevents starting of the engine of a two-wheeled motorcycle even if the two-wheeled motorcycle is brought to an upright position and an attempt is made to start the engine, unless the stand is in an inoperative position. A stand switch is opened by the stand when the latter is in a neutral position so that the ignition circuit for the engine cannot be rendered operative, thereby to prevent actuation of the engine. When the stand is in either the inoperative position or the operative position, the stand switch is closed to permit the engine to be started. A normally open manually-operated switch shunts the stand switch and is capable of operating the ignition circuit regardless of whether the stand switch is closed or open.