To provide a granular material supply device, and a method, capable of efficiently supplying biomass, to a biomass using facility, for example, a combustion furnace and a gasification furnace.

This granular material supply device has a biomass crusher 2 supplied with a prescribed quantity of biomass 11 by a fixed volume supplier 1, a suction fan 3 being an air current carrying means for carrying the crushed biomass 11 in an air current by carrier gas 4, a solid-gas separation means 12 for separating a gas component in the biomass carried in the air current, and a supply pipe 13 for supplying the biomass 11 of separating the gas component, to a burner 5a of a combustion furnace body 5, for example, the biomass using facility such as a combustion or gasification means.