This air-guide device is arranged in the rear of a motor-vehicle body and is designed such that it can be pivoted from a retracted operational position into an extended operational position. For this purpose use is made of an actuating device which comprises an adjusting device and a guide device. The adjusting device is a member which executes dimensional movements transversely with respect to its longitudinal extent and is designed such that it can transmit compressive and tensile loads. The member comprises a plurality of elements which are positioned next to one another and are connected to one another by means of hinges.
