[Problem] To propose a technology that makes it possible to increase an inert gas replacement rate inside a container and achieve an optimum replacement rate in filling a beverage into the container. [Solution] Provided is a method for replacing air inside a container into which a beverage is filled with inert gas, wherein a beverage filling device 20 performs a first counter pressure step, a pre-filling snifting step after the first counter pressure step, a second counter pressure step after the pre-filling snifting step, a filling step after the second counter pressure step, and a post-filling snifting step after the filling step, and performs a combination of the first counter pressure step and the pre-filling snifting step at least once.
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