Abstract: An apparatus for setting a fitting element which is adjustable relative to a support element to various positions, particularly a fitting element for vehicle seats is disclosed. The apparatus includes a locking device which is self-arresting under a load from the return force and having at least two locking elements which engage each other by teeth means which prevent movement of the fitting element, one of said locking elements positioned on the fitting element and the other of said locking elements being movably guided on the support element and movable forcibly only into the locking position against a return force by means of said activating member.