To reduce pressure-compaction of materials-to-be-carried dropped for discharge.

A screw 4 is housed in a screw casing 1 provided with an inlet 2 in an upper part of one side to be driven for rotation by an external driving device 12. Discharge ports 3a, 3b, 3c and 3d are provided at a plurality of positions with required intervals in the carrying direction on a tip side of the screw casing. Each discharge port 3a, 3b, 3c and 3d is provided with an adjustment gate 15 for adjusting opening. In the condition that opening of each discharge port 3a, 3b, 3c and 3d is respectively adjusted by the adjustment gate 15, the material-to-be-carried 13 thrown into the screw casing 1 from the inlet 2 is carried to the tip side by a blade 6 of the screw 4, and discharged from each discharge port 3a, 3b, 3c and 3d for distribution to reduce discharge quantity per one part of the discharge ports 3a, 3b, 3c and 3d.