NOVELTY - A biomass pulverization device has a coarse pulverizing mill(12) for coarsely pulverizing biomass feedstock (11), a separation unit (14) for separating pulverized biomass (13) from the mill into 2 or more particle diameters, a carrier flow path (15) for supplying coarse pulverized biomass (13A) of more than predetermined particle diameter to the mill, a pulverization mill (17) for pulverizing pulverized biomass of less than predetermined particle diameter and forming biomass fine powder (16A), and a biomass fine powder carrier flow path (18) for conveying biomass fine powder to burner side.    USE - Biomass pulverization device for producing biomass fine powder used as fuel for boiler for electric power generation.    ADVANTAGE - The device efficiently and stably enables to pulverize biomass feedstock.    DETAILED DESCRIPTION - A biomass pulverization device has a coarse pulverizing mill for coarsely pulverizing biomass feedstock, a separation unit for separating pulverized biomass discharged from the mill into 2 or more particle diameters, a carrier flow path separated by separation unit and which supplies coarse pulverized biomass of more than predetermined particle diameter to the mill, a pulverization mill for pulverizing pulverized biomass of less than predetermined particle diameter and forming biomass fine powder, and a biomass fine powder carrier flow path for conveying biomass fine powder to burner side. An INDEPENDENT CLAIM is included for biomass/coal mixed combustion system, which has the biomass pulverization device, a coal pulverization device for pulverizing coal raw material, and a boiler furnace to which biomass powder and coal dust material pulverized by the coal pulverization device are supplied.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of biomass pulverization device. (Drawing includes non-English language text)    Biomass feedstock (11)    Coarse pulverizing mill (12)    Pulverized biomass (13)    Pulverized biomass (13A)    Separation unit (14)    Carrier flow path (15)    Biomass fine powder (16A)    Pulverization mill (17)    Biomass fine powder carrier flow path (18)