An object of the present invention is to reduce current consumption for switching and holding an actuation position of an electromagnetic change-over valve included in a vehicle height adjusting device for a motorcycle and to surely hold the actuation position. In a rear-wheel side vehicle height adjusting device (40) for a motorcycle (1), after applying a startup current to a solenoid (60A) of a change-over valve (60) in order switch an actuation position of the change-over valve (60), while switching an applied current to the solenoid (60A) to a holding current which is smaller than the startup current and holding the actuation position of the change-over valve (60), a control section intermittently applies a large current, which is larger than the holding current, to the solenoid (60A).