The present invention relates to a starch-containing tea beverage. More specifically, the present invention relates to a cereal tea beverage containing starch at a content of 0.009% by weight or more, which has an appropriate roasted aroma and mildness peculiar to cereal tea, relieves the pasty texture originating from the starch, and thereby has an improved taste and flavor, as a result of addition of ultrafine ground tea leaves having an average particle size of 1 &mum or less. The present invention also relates to a process for producing such a cereal tea beverage, and a method for improving the taste and flavor of such a cereal tea beverage.