An object is to provide an acid milk beverage, which shows no precipitation or aggregation and reduced whey separation, and which has a refreshing texture, even in cases where the acid milk beverage has a low solids-not-fat concentration. An acid milk beverage characterized by containing an acid milk beverage base and a pectin having an intrinsic viscosity of 5.9 to 8.5, a degree of esterification of 74 to 80, and a calcium reactivity of 230 or less is provided.