The present invention pertains to a method for producing a whey protein hydrolysate, the method comprising a step for subjecting, to a hydrolysis treatment, a whey protein-containing raw material having (a) a lipid content of less than 1 mass%, or/and (b) a lactose content of less than 1 mass%. The present invention can address problems such as off-flavor, bitterness, and unpleasant odor which occur when whey protein is hydrolyzed, and enables production of a whey protein hydrolysate having less odor and good flavor. In addition, a whey protein hydrolysate which is not easily discolored, and a deterioration in quality of which is inhibited during a production process or storage thereof, can be produced.本發明係有關一種具有對(a)脂質含量未達1質量％，或／及(b)乳糖含量未達1質量％之含乳清蛋白質原料，進行水解處理步驟之乳清蛋白質水解物之製造方法。根據本發明，可改善水解乳清蛋白質時產生的雜味與苦味，以及令人不愉快的臭味等問題，可製造臭味較少且具有良好風味的乳清蛋白質水解物。另外，亦可製造不易著色且可抑制於製造步驟及保存中品質降低之乳清蛋白質水解物。
