Provided is a workpiece punch-molding method and a workpiece punch-molding device capable of maintaining the thickness of a workpiece at a constant precision. Prior to the punch of a workpiece by a mold punch and a counter punch, the data denoting a relationship between a punch speed of the mold punch and a delay time of the depressurization of the counter punch is obtained. The counter punch is subjected to the depressurization at an early timing based on the obtained data.