The present invention relates to an adjusting element with a drive shaft (12) having a drive motor (11, which, in two opposite directions of rotation is to be driven in rotation by means of a movement transmission by means (4, 5) an actuating element (3) between two end positions (6, 7) to move back and forth. To simplify the production technique, it is proposed that two motion transmission means (4, 5) in each case have a winding drum (6), on which, in the direction of winding direction in each case a tension element (7) is wound up, the free end is fastened on the actuating element.
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