The present invention provides a first processing step and a second processing step in the case where the hollow carcass of the poultry is broken down into a lower carcass including the thighs and the back part, and an upper carcass including the remaining part of the rib-containing breast and back parts. , in the first processing step, when the hollow body is transported in a suspended state, the hollow body is cut from the thigh root through the tail end of the intestinal bone without cutting the spine; in the second processing step, the femoral part is cut The tendon and connective tissue are cut, that is, the thigh is peeled off. The present invention performs the above processing steps with high productivity. The first processing step includes a conveying line, a peritoneal cutting part, a 90-degree turning part and a processed product separation part. The second processing step consists of a conveyor with teeth, which conveys the lower body half hooked at the femur through an underside running belt; a parallel moving conveyor arranged under the conveyor with teeth for peeling off the thighs of the lower body half; A parallel guide plate is arranged under the lower running belt.