Problem to be solved. To provide a packed roasted green tea beverage having an improved balance between astringency and umami, a method for producing a packed roasted green tea beverage, and a method for improving the taste and flavor of a packed roasted green tea beverage. Solution. The present disclosure provides a packed roasted green tea beverage in which, when the content of non-polymerized catechin is Amg/L and the content of acidic amino acid is Bmg/L, the value of A/B satisfies 30.0-130.0. The present disclosure provides a method for producing a packed roasted green tea beverage, including a step in which when the content of non-polymerized catechin is Amg/L and the content of acidic amino acid is Bmg/L, the value of A/B is set to 30.0-130.0. The present disclosure provides a method for improving the taste and flavor of a packed roasted green tea beverage in which when the content...

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