A device for the attachment of a replaceable wearing part (4) to be attached at a leading edge (22) of an implement (1) is described, wherein, at the leading edge (22), a supporting surface (21) is formed which is arranged to receive and fix a wearing-part holder (3), one of the wearing-part holder (3) and the wearing part (4) forming an attachment projection (31) and the other of the wearing-part holder (3) and the wearing part (4) forming a corresponding socket (43), the attachment projection (31) and the socket (43) being provided with corresponding, cooperating guide portions (32, 431), the guide portions (32) of the wearing-part holder (3) being formed as guide faces (32a, 32c, 32e) facing the supporting surface (21) and being slanted relative to the supporting surfaces (21), falling in a direction away from the leading edge (22).
