Was to strengthen the [challenge] whey protein, water separation is small, there is a richness, it is desirable to provide a method for organizations to economically produce smooth stirring type yogurt. Are mixed in raw milk which is reacted with the transglutaminase was added to a solution of a high concentration of milk whey protein of high purity separated from [SOLUTION] milk, etc., and concentrated, then inoculated with lactic acid bacteria and fermented I to produce a stirring type yogurt.〔課題〕ホエイ蛋白質を強化した、離水が少なく、濃厚感があり、組織が滑らかな攪拌型ヨーグルトを経済的に製造する方法を提供すること。〔解決手段〕牛乳等から分離、濃縮した高純度の乳ホエイ蛋白質を高濃度で溶解した溶液にトランスグルタミナーゼを作用させたものを原料乳に混合し、次に、乳酸菌を接種し、発酵させて攪拌型ヨーグルトを製造する。