According to the present invention, a person who is presented with a chilled beverage immediately experiences the unprecedented and completely novel sensation of easily being able to drink the containerized beverage through the opening of a container in which the containerized beverage is in a liquid state when unopened, and starts to solidify when opened, regardless of whether external force is applied to a beverage-accommodating part. The present invention includes a cooling step in which a containerized beverage having a first solidification point at the pressure in the empty portion inside the container when closed, and a second freezing point at atmospheric pressure when the container is opened, the first freezing point being lower than the second freezing point, is cooled in the closed state at a temperature that is higher than the first freezing point and lower than the second freezing point. Upon opening the containerized beverage when the temperature of the containerized beverage is higher than the first solidification point and lower than the second solidification point, the person can see that the containerized beverage is a solid, regardless of whether external force has been applied to the beverage-accommodating part of the containerized beverage.
