To produce the subject beverage improved into an excellent flavor such as that emitted in a tea room by mixing a filtered coffee ingredient freed of microorganisms with a thermally sterilized milk ingredient.

A filtered coffee ingredient freed of microorganisms is mixed with a thermally sterilized milk ingredient. The coffee ingredient is filtered and freed of the microorganisms and the milk ingredient is thermally sterilized. Both the ingredients are subsequently mixed under an aseptic environment and then directly filled in a sterilized container under the aseptic environment or both are respectively directly filled in the container under the aseptic environment and the container can hermetically be sealed to afford the milk-containing coffee beverage filled in the hermetically sealed container. The pore diameter of the filter used for filtration and removal of the microorganisms on the side of the coffee ingredient is preferably ≤0.45 μm. Any of a high-temperature short-time sterilizing method, a high-temperature instantaneous sterilizing method, an ultrahigh temperature sterilizing method(UHT method), a high- pressure sterilizing method, etc., can be used for the thermal sterilization on the side of the milk ingredient; however, the UHT method is preferred.