Provided is a caffeine-reduced green tea beverage packed in a container which can be enjoyed either hot or cold, and which has a sweet aroma and rich full-bodied flavor. The green tea beverage packed in a container has a caffeine concentration of less than 90 ppm, and a total sugar concentration (obtained by adding the concentration of nonreducing sugars and the concentration of reducing sugars) that falls within the range of 150 ppm to 500 ppm; a ratio of the concentration of nonreducing sugars to the concentration of reducing sugars (non-reducing sugars/reducing sugars) that falls within the range of 2.0 to 13.0; a ratio of ester catechins to sugar concentration (ester catechins/sugars) that falls within the range of 0.9 to 2.2; and a percentage of the concentration of theanine to the concentration of caffeine (theanine/caffeine×100) of at least 10.0.