TECHNICAL FIELD The present invention relates to an acidic milk drink which suppresses separation and precipitation of acidic milk drinks and has a low viscosity and easy to swallow in an acidic milk drink containing a milk protein containing a high concentration of casein and a process for producing the acidic milk drink. More specifically, the present invention relates to a soybean polysaccharide comprising 0.2 to 1.2% by weight soybean polysaccharide, 0.1 to 0.5% by weight HM pectin, 0.01 to 0.1% by weight fibrous insoluble cellulose And an acidic milk beverage according to the present invention.本発明は、高濃度のカゼインを含む乳タンパク質を含有する酸性乳飲料において、酸性乳飲料の分離及び沈殿を抑制し、低粘度で飲みやすい形態の酸性乳飲料及びその製造方法に関する。より詳しくは、本発明は、0.2~1.2重量%の大豆多糖類、0.1~0.5重量%のHMペクチン、0.01~0.1重量%の繊維状の不溶性セルロースを含有することを特徴とする、本発明の酸性乳飲料を提供する。
