Fastening device

A fastening device for fastening add-on parts on carrier components, wherein the fastening device has a plug-in locking device, for locking to a carrier component, and a releasable rotary locking device, which is spaced apart axially from the plug-in locking device and is intended for locking to an add on part, wherein the rotary locking device has an axial supporting element and at least one locking wing, which is spaced apart axially from the supporting element and extends away radially from an axial shank of the fastening device, wherein the supporting element and the at least one locking wing have axial locking surfaces, which are located axially opposite one another, wherein the axial locking surface of the supporting element is arranged axially between the locking wing and the plug-in locking device, wherein the rotary locking device also has a rotary locking stop, which delimits the rotating-in and/or rotating-out action;

• further including a locking contour, which is designed to interact with a mating locking contour of an add-on part, thereby securing a locked position of the fastening device on the add-on part, wherein the locking contour is a semi-cylindrical or partially cylindrical elevation, which is formed on the axial locking surface of the supporting element or on the axial locking surface of the at least one locking wing.