Abstract: A powder or granular material feeding apparatus includes a guide cylinder having a plurality of gas suction holes that guides gas in an interior thereof to an outside, a filter provided on a portion of the guide cylinder where the gas suction holes are formed, a gas feed unit configured to feed inert gas, an auger including a revolving shaft positioned in the guide cylinder and a blade provided on the revolving shaft, and an suction device. The revolving shaft includes a gas feed channel configured to guide the inert gas and a gas feed port configured to allow the inert gas to eject therefrom to cause the powder or granular material to contain the inert gas. The suction device sucks the gas in the guiding cylinder to the outside of the guide cylinder.