The present invention is related to a packed beverage containing potassium alginate and having a pH of 3.1 or higher, wherein the beverage has an alginic acid content of 0.3 to 8 mass % and a potassium content of 0.05 to 2.6 mass %, and the potassium content satisfies the formula 1: (0.85×alginic acid mass %)0.5&gEpotassium mass %&emsp&emsp(1). The present invention provides a packed beverage for potassium intake, which has a reduced bitter/salty taste intrinsic to potassium and reduced lingering aftertaste and which has an excellent flavor.
