PURPOSE: To minimize the damage of a molded product main body and to prevent the irregularity of the cutting shape or position caused by the intrusion of the molded product main body in the gap between blade members.

CONSTITUTION: A cutter is equipped with an air nipper and blade members 10. The surfaces on the side of a molded product main body 2 of the blade members 10 are formed into the curved shape protruding toward the molded product main body 2. A stopper 20 having a flat contact surface 19 formed so as to be flush with the surfaces of the contact parts 17 of the blade members and not participated in cutting is attached to the main body parts of the blade members 10. At the time of cutting, the contact surface 19 of the stopper 20 and the contact parts 17 of the blade members 10 come into contact with the end part of the molded product main body 2 at the almost same time and, therefore, a cutting position is not changed even when the size of a grille molded product 1 is not constant. Further, the contact areas with the molded product main body 2 of the blade members 10 at the time of cutting can be made relatively small and the contact parts 17 become hard to come into contact with the part unnecessary to cut of the molded product main body 2.