PROBLEM TO BE SOLVED: To provide a method for improving a taste quality of a sweetener composition and a stevia extract excellent in sweetness quality.SOLUTION: A method for improving a taste quality of a sweetener composition, which contains rebaudioside A and mogroside V in a weight ratio of 95:5 (excluding 95:5) to 99:1, preferably, 95:5 (excluding 95:5) to 98:2, and a stevia extract, which is blended with rebaudioside A and mogroside V in a weight ratio of 95:5 (excluding 95:5) to 99:1, preferably, 95:5 (excluding 95:5) to 98:2, improves sweetness quality of the stevia extract, and can bring the sweetness quality closely to sweetness quality of sugar.SELECTED DRAWING: None