A powder filling nozzle is used for filling up a container with a powder
mixed with a gas and in a fluidized state. The power filling nozzle
comprises a tubular body having an opening for discharging the powder in
the fluidized state into the container, and a gas separating unit
disposed near the opening of the tubular body and allowing the gas
delivered together with the powder in the tubular body to pass through
the gas separating unit but not allowing the powder to pass through the
gas separating unit. The gas separating unit serves to set the opening in
a plugged state by the powder separated from the gas, so that the
delivery of the powder from the tubular body into the container is
stopped.