In pinch trimming, a rounding close to the rounding radius of the flange is provided. The tip of the punch is an edge. The clearance is made zero or close to zero. The trimming is done by pushing the product into the die. Basically, no step is formed in the outer periphery (if a clearance is provided, a step corresponding to the size of the clearance will be formed). Rounding remains inside the product. When the cut edge has to be made neat, although cutting is made horizontally using a cam, etc., the structure of the die becomes complex.