Abstract: An apparatus for the inward or final folding of end portions of a covering on a panel (5). The covering (1) surrounds the panel (5) and extends out over one edge to such an extent that at least first inward folds (17, 18) overlap one another from two opposite edges. Second inward folds (16) from the two opposing edges are located inside the overlapping, first inward folds (17, 18). A corner support (21) is placeable in the corner for folding of the second inward fold (16) about the corner support (21), with the aid of a stirrup (38) which is switchable for inward folding of the second inward fold (16) about the corner support (21) while leaving exposed an adhesive application surface on the second inward fold (16). A first folder (43) is provided for inward folding of one first inward fold (17), and a second folder (44) is provided for inward folding of another first inward fold (18) after application of adhesive to the adhesive application surface.