An adapter (38, 66) for the articulated connection of a wiper blade (24) to a wiper arm (10) using the sidelock system, wherein the adapter (38, 66) has an essentially cylindrical longitudinally slotted bearing element (40, 68), which can be inserted into passages (34) in side walls (30) of a suspension box (28) of the wiper blade (24) and can be fixed on a first end on the edge of a passage (34) by means of locking hooks (50), while its second end is connected with a bearing surface (54, 78), which is adjacent to the outer side of the opposing side wall (30) and is secured against twisting by at least one clip (58, 80). The clip (58, 80) has a locking nose (60), which points in the direction of the bearing element and locks on an edge of the coordinating side wall (30) of the suspension box (28) during assembly.