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).
