The vibrating feeder which has generally been used has its flow control devices installed on the outside of the hopper discharge. This paper presents a gravity discharge characteristic of a powder from hopper that used rubber film vibration by air pressure. The structure of proposed hopper is the double structure which inserted soft container in the conical rigid container. The result ofthe experiment revealed that proposed hopper was effective for the bridging of the powder. And the discharge of the powder affects the timing of aerial supply pressure and applying pressure.