An actuator device (2) for actuating at least one foot pedal (P) of a motor vehicle has at least one actuating element (8), whereby, for applying force to the foot pedal (P), said actuating element is shifted by means of a positioning mechanism (10) between an application position and a released position. It is provided that the positioning mechanism (10) is drivable with a positioning force (SF), by means of inertial means (such as an inertial mass).