A fastening device, in particular, is part of a fastening system for detachably fixing components (42,44) to one another, such as wall coverings to walls, preferably in the field of interiors. The fastening device has a support part (2) including a support plate (12) with protruding closure elements (24) on one side and a protruding fixing part (4) with a fixing structure (26) on the other, opposite side (8). The fixing part (4) has an axial length preferably less than or equal to each radial length of the support part (2) extending transversely to it. The fixing structure (26) of the fixing part (4) is self-locking or self-tapping. The support plate (12) has a cut-out (36) for applying an operating tool. The cut-out extends from the support plate (12) into the fixing part (4) and is free by the closure elements (24).