NOVELTY - Manufacture of ethanol involves performing saccharification decomposition process (FF) of hemicellulose contained in slurry of cellulose biomass (AA), forming 5C saccharide, separating slurry into solid and liquid, reslurrying (HH), performing saccharification decomposition process (JJ) of cellulose contained in slurry of re-slurried cellulose biomass, forming 6C saccharide, separating slurry into solid and liquid, concentrating 5C saccharified liquid and 6C saccharified liquid, carrying out alcoholic fermentation (VV) of concentrated saccharified liquid, and concentrating.    USE - Manufacture of ethanol used for decomposing cellulose biomass and alternative fuel of gasoline.    ADVANTAGE - The method economically and efficiently provides ethanol.    DETAILED DESCRIPTION - Manufacture of ethanol involves performing saccharification decomposition process of hemicellulose contained in slurry of cellulose biomass and has solid substance concentration of 1-5 %mass by hydrothermal-processing at 140-200 degrees C under 1-5 MPa, forming 5C saccharide, separating slurry into solid and liquid, reslurrying such that water is added to the dewatering cake obtained during solid-liquid-separation process and forms solid substance concentration of 1-5 %mass, performing saccharification decomposition process of cellulose contained in the slurry of re-slurried cellulose biomass by hydrothermal-processing at 240-300 degrees C under 4-10 MPa, forming 6C saccharide, separating the slurry into solid and liquid, concentrating 5C saccharified liquid and 6C saccharified liquid having saccharide concentration of 10 %mass or more, carrying out alcoholic fermentation of concentrated saccharified liquid, distilling, and concentrating ethanol.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart explaining manufacture of ethanol. (Drawing includes non-English language text)    Cellulose biomass (AA)    Saccharification decomposition process (FF)    Reslurrification (HH)    Saccharification decomposition process (JJ)    Alcoholic fermentation (VV)