Abstract: It is to provide a method that enables manufacture of beer or HAPPOSHU with good fermentation with yeast and having rich flavor, by improving the fermentability of premature yeast flocculation malt (PYF malt) (malt comprising factors causing early flocculation of yeast) even when PYF malt is used in the manufacture of beer or HAPPOSHU. In the manufacture of beer or HAPPOSHU using premature yeast flocculation malt (PYF malt), tannic acid is added and treated to wort and/or yeast used for fermentation, to improve the fermentability of premature yeast flocculation malt. In the present invention, in order to improve fermentability of early flocculatin malt, tannic acid is added and treated to wort before addition of yeast or to wort fermentation solution after adding yeast, or to yeast for adding to wort, in the manufacturing step of beer or HAPPOSHU. Preferred tannic acids used in the present invention include gallotannin, tara-tannin, gallic tannin (hydrolysable tannin) and persimmon tannin (condensed tannin).