Abstract: An adjusting device serves for moving a moveable part into various positions, for example a side ventilator window of a motor vehicle. A servomotor (14) drives a spindle drive (18) which comprises essentially a spindle (24) having an external thread (26) and a sleeve part (28) which surrounds the spindle and has a corresponding internal thread (30). When acted upon by an external force, axial play in the region of the spindle drive (18) may lead to noise being produced; in order to avoid the noise, one (30) of the two threads comprises separate threaded parts (32, 36), and an elastically prestressable element (38) is provided with the aid of which an axial force can be produced between the two threaded parts (32, 36). The axial force causes the two threaded parts (32, 36) each to bear against opposite flanges of the external thread (26), so that the axial thread play is eliminated.