PROBLEM TO BE SOLVED: To provide a container-filled beverage from which umami and sweetness of theanine can be effectively recognized.SOLUTION: There is provided a container-filled beverage comprising theanine, glutamic acid, (A) mono-galactosyl diglyceride and (B)di-galactosyl diglyceride, wherein the contents thereof, per 1 L of the beverage, are (i) theanine 20-80 mg, and glutamic acid 1 mg or more, preferably 5 mg or more, (ii) (A)=0.8-8.0 mg and (A)+(B)=1.3-12.0 mg, and (iv) (A)/(B)=0.90-3.0.SELECTED DRAWING: None