Provided is a fermented milk-containing beverage for which long-term storage stability is extremely difficult, the beverage containing milk protein particles which have undergone modification in a fermentation process, wherein long-term coagulation and precipitation of the milk protein and syneresis are inhibited, perception of pastiness in terms of flavor is not present, ease of swallowing is good. This fermented milk-containing beverage contains fermented milk containing nonfat milk solids, soybean polysaccharides, and HM pectin. The nonfat milk solids content is 0.5 to 6.0 mass% with respect to the entire amount of beverage, the total content of the soybean polysaccharides and HM pectin is 0.3 to 0.8 mass% with respect to the entire amount of beverage, and the content ratio of the soybean polysaccharides and HM pectin is 3:1 to 1:4 in terms of mass ratio.
