NOVELTY - Fermentation apparatus comprises device for carrying out high-temperature processing of biomass feedstock, cooling unit, enzyme saccharification tank, foreign substance removal unit provided with a solid-liquid separation device and microfiltration membrane for removing water-insoluble fermentation inhibitors contained in a sugar solution, dilution tank disposed downstream from the foreign substance removal unit, water separation unit provided with a reverse osmosis membrane, and fermentation tank.    USE - The apparatus is useful for fermenting feedstock biomass e.g. sugarcane and maize for producing sugar solution and products e.g. ethanol and cellulose.    DETAILED DESCRIPTION - Fermentation apparatus comprises device for carrying out high-temperature processing of biomass feedstock, cooling unit (90) for cooling a biomass liquid that has undergone high-temperature processing (101A), enzyme saccharification tank (103) in which a cooled liquid (101B) is enzymatically saccharified, foreign substance removal unit (113) provided with a solid-liquid separation device (112) and microfiltration membrane (113a) for removing water-insoluble fermentation inhibitors contained in a sugar solution (104) extracted from the enzyme saccharification tank, dilution tank (132) disposed downstream from the foreign substance removal unit, in which the sugar solution from which water-insoluble fermentation inhibitors are removed is diluted by adding water, water separation unit (116) provided with a reverse osmosis (RO) membrane (116a) for removing water (114) from the diluted sugar solution to obtain a concentrated sugar solution (115), and fermentation tank (141) for carrying out fermentation using the concentrated sugar solution, where the fermentation apparatus uses feedstock biomass as a raw material.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of the apparatus for fermenting feedstock biomass. (Drawing includes non-English language text)    Cooling unit (90)    Biomass liquid undergone high-temperature processing (101A)    Cooled liquid (101B)    Enzyme saccharification tank (103)    Sugar solution (104)    Solid-liquid separation device (112)    Foreign substance removal unit (113)    Microfiltration membrane (113a)    Water (114)    Concentrated sugar solution (115)    Water separation unit (116)    Reverse osmosis membrane (116a)    Dilution tank (132)    Fermentation tank (141)