PURPOSE: To accurately perform quantitative supply of granule within a preset permissible amount in a metering hopper with a continuous small input by directly arranging the metering hopper just below large and small supply cylinders.

CONSTITUTION: In granule put into a granule feeder, by rotating its rotary blade, large supply is started to a large supply cylinder 2 of opening an opening/ closing gate 3 from the first discharge port 1, simultaneously with supplying also into a storage tank 4 from the second discharge port 1. After ending the large supply, an opening/closing gate 3' of a small sized quantitative feeder 5 is opened, and by operating it, small supply is started and stopped by a signal of metering completion. Further in the discharge ports 1, 1' with no supply performed, since the opening/closing gates 3, 3' are automatically closed, supply accuracy is prevented from being influenced by naturally dropping the granule. By stopping the small sized quantitative feeder 5 in a small supply side after stopping the granule feeder in a large supply side by simultaneously performing large and small supplies, vibration at the time of starting the small sized quantitative feeder can be prevented, and an influence to metering accuracy can be eliminated.