PROBLEM TO BE SOLVED: To provide a method for producing a tea beverage which reduces caffeine while suppressing changes of appearance and flavor.SOLUTION: A method for producing a tea beverage includes a step of bringing clay and a cation into contact with a tea extract. The clay is acid clay. The cation is one or two or more selected from the group consisting of a potassium ion, a calcium ion, and a magnesium ion. The step of bringing the clay and the cation into contact with the tea extract is a step of adding magnesium chloride and/or calcium chloride to the tea extract. The cation is added to the tea extract so that the concentration of the cation brought into contact with the tea extract is 0.01-50 mM.