A pressing machine including a punch, which is in a state of being inserted into a cylindrical workpiece, enters a forming hole of a die to strip off or draw a cylindrical wall of the workpiece between an outer surface of the punch and an inner surface of the forming hole, the forming hole including a first tapered portion, a narrowest portion and a second tapered portion in order from a top, the pressing machine comprising: a stripper; a knockout pin; and a controller including a control circuit controlling the punch, the stripper and the knockout pin to perform the following motions in synchronization: the stripper descends together with the punch descending toward a bottom dead center while maintaining a space above the workpiece and moves to a lower limit position, when the stripper is disposed at the lower limit position, a thin cylindrical portion provided at a lower end of the stripper is received in the forming hole, and a distal end surface of the thin cylindrical portion is positioned slightly above a boundary portion between the first tapered portion and the narrowest portion, the stripper comes into contact with the workpiece to retain part or a whole of the workpiece within the forming hole wherein the punch moves toward a top dead center, the entire punch comes out of the workpiece in a state where the workpiece is stayed within the forming hole by the stripper, and the knockout pin ascends and comes into contact with a bottom wall of the workpiece and pushes the workpiece out of the forming hole such that the workpiece ascends in a state of being sandwiched between the knockout pin and the stripper after the part or the whole of the punch has come out of the workpiece. a stripper; a knockout pin; and a controller including a control circuit controlling the punch, the stripper and the knockout pin to perform the following motions in synchronization: the stripper descends together with the punch descending toward a bottom dead center while maintaining a space above the workpiece and moves to a lower limit position, when the stripper is disposed at the lower limit position, a thin cylindrical portion provided at a lower end of the stripper is received in the forming hole, and a distal end surface of the thin cylindrical portion is positioned slightly above a boundary portion between the first tapered portion and the narrowest portion, the stripper comes into contact with the workpiece to retain part or a whole of the workpiece within the forming hole wherein the punch moves toward a top dead center, the entire punch comes out of the workpiece in a state where the workpiece is stayed within the forming hole by the stripper, and the knockout pin ascends and comes into contact with a bottom wall of the workpiece and pushes the workpiece out of the forming hole such that the workpiece ascends in a state of being sandwiched between the knockout pin and the stripper after the part or the whole of the punch has come out of the workpiece. the stripper descends together with the punch descending toward a bottom dead center while maintaining a space above the workpiece and moves to a lower limit position, when the stripper is disposed at the lower limit position, a thin cylindrical portion provided at a lower end of the stripper is received in the forming hole, and a distal end surface of the thin cylindrical portion is positioned slightly above a boundary portion between the first tapered portion and the narrowest portion, the stripper comes into contact with the workpiece to retain part or a whole of the workpiece within the forming hole wherein the punch moves toward a top dead center, the entire punch comes out of the workpiece in a state where the workpiece is stayed within the forming hole by the stripper, and the knockout pin ascends and comes into contact with a bottom wall of the workpiece and pushes the workpiece out of the forming hole such that the workpiece ascends in a state of being sandwiched between the knockout pin and the stripper after the part or the whole of the punch has come out of the workpiece.