A beverage is prepared, which is a beverage containing catechin in ester form (A), catechin in free form (B), and caffeine (C), the contents thereof being (A)+(B)=500 to 6000 mg/L (1) (A)/[(A)+(B)]=0.7 to 1.0 (2) (A)/(C)=6 to 27, (3) to maintain a high concentration of catechin with high biological functionality, with improved flavor and improved product quality in regard to occurrence of sediment and the like.