A tea-polymerized polyphenol-containing beverage, and production method thereof, is provided in which the bitter taste of the tea-polymerized polyphenol is reduced while the favorable tea-like flavor is maintained. The content of tea-polymerized polyphenol in the beverage is adjusted to within a specific range, the total content of RebM and RebD in the beverage is adjusted to within a specific range, and the weight ratio of the total content of RebD and RebM to the content of the tea-polymerized polyphenol is adjusted to within a specific range.