The present invention relates to a brewer's yeast having an improved flavor obtained by treating a brewer's yeast with a diglycosidase or a brewer's yeast extract having an improved flavor obtained by treating a brewer's yeast extract with a diglycosidase, and by such an invention, a brewer's yeast or brewer's yeast extract having a reduced bitterness or enriched body of the brewer's yeast or brewer's yeast extract can be provided.;The invention also relates to a method for producing a brewer's yeast comprising treating a brewer's yeast with a diglycosidase to obtain an improved flavor or a method for producing a brewer's yeast extract comprising treating a brewer's yeast extract with a diglycosidase to improve the flavor, and by such an invention, a brewer's yeast or brewer's yeast extract having a reduced bitterness or enriched body can be produced.
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