Abstract: A compression molding machine for powdered material is provided with a measuring means which samples a product automatically and measures weight and thickness of the sampled product, a position adjusting means for adjusting a predetermined distance between compressing components, a weight control means which is used alternatively to a basic control means and controls an amount adjusting means so that the measured weight of the product measured by the measuring means becomes approximate to a predetermined reference value of weight, a thickness control means which is used alternatively to the basic control means and controls position adjusting means so that the measured thickness of the product measured by the measuring means becomes approximate to a predetermined reference value of thickness. The compression molding machine also comprises a reference pressure calibration means which calibrates the reference value of pressure.