PROBLEM TO BE SOLVED: To provide an acidic beverage having enhanced sweetness while suppressing an increase in the amount of sweetener.SOLUTION: An acidic beverage comprises following components (A), (B) and (C): (A) acidulant; (B) sweetener of 0.1-4 mass% in concentration in terms of sucrose sweetness, and (C) casein peptide of 0.01-1 mass%, with the acidity of 0.003-1 mass%.SELECTED DRAWING: None【課題】甘味料の増量を抑えながら、甘味の増強された酸性飲料を提供すること。【解決手段】次の成分(A)、(B)及び(C);(A)酸味料(B)甘味料 ショ糖甘味換算濃度で0.1~4質量%、及び、(C)カゼインペプチド 0.01~1量%を含有し、酸度が0.003~1質量%である酸性飲料。【選択図】なし