To provide an amino acid component-containing drink composition in which unpleasant taste derived from amino acid or amino acid metabolites is suppressed; and to provide an amino acid component unpleasant taste masking agent, and a method for improving unpleasant taste derived from the amino acid component.SOLUTION: An amino acid component-containing drink composition contains at least one kind of amino acid component selected from a group comprising amino acid and amino acid metabolites. The amino acid component-containing drink composition further contains at least one kind of sugar carboxylic acid component selected from a group comprising sugar carboxylic acid in which an aldehyde group on the reduction terminal side of a starch decomposition product or a transfer reaction product with a degree of polymerization of 2 or more is oxidized, its salt and its lactone.SELECTED DRAWING: None

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