A device for processing a carcass part of slaughtered poultry in a processing line is provided. The carcass part is supported on a carrier that moves in the processing line. The carcass part includes wing-joints, coracoids, a wishbone embodied with two legs that merge into each other at an acute angle, a keelbone, a membrane and/or ligament that connects at least to the wishbone and the keel-bone, and naturally present meat including inner and outer fillets. The device includes apparatus for cutting and/or removing of the wishbone from the carcass part. The device is arranged such that the apparatus for cutting and/or removing of the wishbone can be a knife equipped to cut the wishbone and disconnect it from the membrane and/or ligament with an increased yield of meat that is retained on the carcass part. In one embodiment, the knife is arranged with cutting side-edges and is further shaped with an S-shaped contour to arrange that when same is introduced between the legs of the wishbone up to its eventual position wherein the arrow's point of the knife approaches the part where the legs of the wishbone merge into each other, the cutting side-edges of the knife cut the legs of the wishbone at a position immediately adjacent to the wing-joints to which the wishbone connects.