PROBLEM TO BE SOLVED: To provide a tenderloin creasing mechanism as a tenderloin creasing mechanism of creasing tenderloin from the side, making a yield of tenderloin high, and causing no meat texture lowering of tenderloin.SOLUTION: A tenderloin creasing mechanism creases tenderloin from the side by approaching/separating from the side to/from a poultry carcass upper half part chicken bone with tenderloin, held by a holding member internally engaged with a pleural cavity, and relatively moving the poultry carcass upper half part chicken bone with tenderloin to a longitudinal extension direction of the carina of the poultry carcass upper half part chicken bone, and includes a knife formed from a thin plate material of a spring steel, and a knife drive mechanism advancing/retreating the knife.SELECTED DRAWING: Figure 3
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