A compression molding device compression-molds resin to a workpiece in which components are mounted on a carrier via connection members, and produces packages each having at least one component resin-sealed therein. The compression molding device comprises: a measuring part measuring the weight of the workpiece; a calculation part calculating the supply amount of the resin based on the weight of the workpiece measured by the measuring part; a supply part supplying the resin in the supply amount calculated by the calculation part; and a molding die for compression-molding, to the workpiece, the resin supplied by the supply part. The calculation part calculates the total volume of mounted objects, including the components and the connection members, based on the weight of the workpiece and calculates the supply amount of the resin based on the total volume of the mounted objects.