An instant beverage powder with non-polymer catechins contained at high concentration has improved flavor and taste owing to reductions in bitterness and astringency, and also provides improved flavor and taste and improved stability in external appearance after reconstituted into a beverage. The instant beverage powder contains the following ingredients (A) and (B) : (A) from 0.5 to 20.0 wt% of a purified product of green tea extract, said purified product being obtained by purifying the green tea extract in a mixed solution of ethanol and water at a weight ratio of from 99/1 to 75/25, and (B) from 0.01 to 10.0 wt% of a hydroxycarboxylic acid or a lactone, or a salt thereof. The content of non-polymer catechins in the instant beverage powder is from 0.5 to 15.0 wt%.
