Method for processing a carcass part of slaughtered poultry, which carcass part comprises at least part of a rib cage, meat which is naturally present on said rib cage, a neck opening and at least a part of the wishbone, which method comprises the following steps: - applying and fixing the carcass part to a product carrier, which product carrier is moveable along a path and which product carrier engages on the inside of the carcass part, - moving a block into the carcass part through the neck opening of the carcass part, which block has a recess for receiving the wishbone or that part of it which is present, and which block is arranged between the two limbs of the wishbone or between the locations at which these limbs would be located if the entire wishbone were present, - cutting the wishbone or that part of it which is present loose from the carcass part on the side facing the back side of the carcass part by introducing a first wishbone blade along one side of the block, the first wishbone blade having a cutting edge, the contour of which substantially corresponds to the outer contour of the complete wishbone, characterised in that the method further comprises the following steps: - introducing two second wishbone blades into the carcass part on either side along the block, preferably substantially perpendicular to the first wishbone blade, the second wishbone blades substantially following the outer contour of the complete wishbone, and cutting the wishbone or that part of it which is present loose from the carcass part, in such a manner that the wishbone or that part of it which is present is enclosed between the block, the first wishbone blade and the second wishbone blades, - pulling the block, the first wishbone blade and the second wishbone blades back out of the carcass path together, in such a manner that the wishbone or that part of it which is present remains enclosed between the block, the first wishbone blade and the second wishbone blades and is thereby removed from the carcass part. - applying and fixing the carcass part to a product carrier, which product carrier is moveable along a path and which product carrier engages on the inside of the carcass part, - moving a block into the carcass part through the neck opening of the carcass part, which block has a recess for receiving the wishbone or that part of it which is present, and which block is arranged between the two limbs of the wishbone or between the locations at which these limbs would be located if the entire wishbone were present, - cutting the wishbone or that part of it which is present loose from the carcass part on the side facing the back side of the carcass part by introducing a first wishbone blade along one side of the block, the first wishbone blade having a cutting edge, the contour of which substantially corresponds to the outer contour of the complete wishbone, - introducing two second wishbone blades into the carcass part on either side along the block, preferably substantially perpendicular to the first wishbone blade, the second wishbone blades substantially following the outer contour of the complete wishbone, and cutting the wishbone or that part of it which is present loose from the carcass part, in such a manner that the wishbone or that part of it which is present is enclosed between the block, the first wishbone blade and the second wishbone blades, - pulling the block, the first wishbone blade and the second wishbone blades back out of the carcass path together, in such a manner that the wishbone or that part of it which is present remains enclosed between the block, the first wishbone blade and the second wishbone blades and is thereby removed from the carcass part.