To provide a glass powder feeder for lubricating a hydraulic press by using a feed hopper capable of feeding glass powder of the predetermined amount in the feed hopper and reliably feeding it to the last.

The glass powder feeder for lubricating the hydraulic press has a mechanism in which a rotary blade 5 is provided on a lower outlet 3 in the feed hopper 1 containing glass powder 9 in order to discharge glass powder 9 of the predetermined amount in the feed hopper, a shaft 6 with the rotary blade 5 fitted thereto is driven by a motor 7, and glass powder 9 packed in the feed hopper 1 is forcibly scooped and discharged to a lower part of the hopper. A vibrating device 8 to provide vibration to a side wall 4 of the feed hopper 1 is fitted to the feeder.