PURPOSE: To reduce error in the weighing while reducing manpower by automating the feeding and weighing works of a plurality of types of powder material.

CONSTITUTION: Feeding quantity (weight) of each powder material is previously stored, for each type of mixture, in a memory circuit 9. When an operator depresses a type button on an operating board 7 and then depresses a start button, a driver 14 drives a motor 13 through a controller 6 to move a moving body 3 on a rail 12 to a position corresponding, for example, to a hopper 1 where material A is stored. When a position sensor 15 detects stoppage of the moving body 3, the controller 6 controls a valve 11 to feed the opening/ closing means 2 of the hopper 1 with the air thus opening the opening/closing means 2. Consequently, the hopper 1 feeds the material A, having particle sized made uniform by a crashing means 8, to a cup 4. In this regard, a weighing means 5 weighs the material A automatically and when the increment thereof reaches a predetermined value, the controller 6 feeds the air to the opening/ closing means 2 thus closing the hopper 1 and shifting the moving body 3 to a next position.