To provide a powder-form raw material supplying device of simple structure capable of supplying simply a fixed small quantity of powder-form raw material in a very narrow range partially.

The powder-form raw material supplying device is equipped with a body to store the powder-form raw material, a raw material supply pipe protruding to outside the body from inside its lower part, a raw material supplying screw installed inside the supply pipe, and a raw material agitator attached to the screw. The device body is composed of an upper part in a cylindrical shape and a lower part in a funnel shape. The supply pipe has its top positioned at the lower part of the funnel shape of the body, while the screw has an assist wire wound spirally round the center wire and is rotated by the power applied over. The agitator is installed in the position of the funnel lower part and attached to the center wire positioned just over the top of the supply pipe. This enables supplying a fixed quantity of raw material simply with the device structure remaining simple.