A packaged beverage with a green tea extract mixed therein, comprising the following ingredients (A), (B) and (C): (A) from 0.01 to 1.0 wt % of non-polymer catechins, (B) oxalic acid or a salt thereof, and (C) caffeine, wherein a content weight ratio [(B)/(A)] of said oxalic acid or salt thereof (B) to said non-polymer catechins (A) is from 0.00005 to 0.1, and a content weight ratio [(A)/(C)] of said non-polymer catechins (A) to said caffeine (C) is from 5 to 10000. The packaged beverage contains catechins at high concentration, is reduced in bitterness and astringency and is suited for long-term drinking, is excellent in the stability of bitterness and astringency and also in the feeling as it passes down the throat, and further, remains stable in its color tone even when filled in a clear container and stored at high temperatures.