Abstract: A powder grain material control unit has a cylindrically formed filter and a negative pressure chamber formed at the outer periphery of the filter. As powder grain material is discharged from an outflow portion of the powder grain material control unit, the inner peripheral portion side of the cylindrical filter is negatively pressurized so as to absorb and maintain the powder grain material of this part on the cylindrical filter side and so as to stop the discharge of the powder grain material flowing on the inner peripheral portion side of the cylindrical filter. The control unit may be used in combination with a powder grain filling unit that includes material carrying means which may be an auger having a spiral blade provided with a central axis of rotation.