Abstract: To provide the manufacturing method for the press work product reducing the chance of causing distortion of the countersink as press-forming the countersink. This is the manufacturing method for a press work product which has a tapped bore for a stem of a flat countersink head screw to penetrate therethrough and a countersink formed around a circumferential line of the tapped bore for a head of the flat countersink head screw to seat therein, comprising steps of forming a work as the press work product by punching a plate material, trimming an outside diameter of said work, and forming said countersink by inserting said work after trimming the outside diameter into a press die to press form thereof.