The present invention relates to a device for adjustment of the level of inclination of the back part of a motor vehicle seat having a device part (2) connected to the seat part and a device part (3) connected to the backrest, which can be pivoted opposite to each other about a pivot axis (14), wherein both device parts (2, 3) have parts of gearings (4, 5) forming a swash mechanism, which roll over each other under the influence of cam means (11) that can be rotated about a pivot axis (14). The drive of the cam means (11) is provided via a two-part carrier, comprised of a metal carrier boss (17) and a metal carrier plate (18) non-rotatingly connected therewith. The carrier boss (17) has a collar (17.2) for axial bracketing of the device parts (2, 3) on one side of the device for adjustment of the level of inclination (1). The object is to configure this type of device for adjustment of the level of inclination, so that no longer requires an additional locking ring for axial bilateral bracketing of the device parts (2, 3). The solution resides in the fact that the carrier plate (18) is fastened axially to the carrier boss (17) on the other side of the device for adjustment of the level of inclination (1) for completion of the bracketing of the device parts (2, 3).