To provide a powder feeder for continuously and stably feeding a powder.

This powder feeder 100 comprises a tubular body 10 allowing the powder 30 to lead therein, an eccentric body 14 placed on the tubular body 10 in the state of being non-contact with the lower end part thereof and having a bottom part 26 formed of a sloped surface tilted downward from its center part to its outer peripheral part, and an eccentric drive means driving the eccentric body 14 eccentrically to the center axis thereof. The eccentric drive means comprises an eccentric plate 40 on which the eccentric body 14 is placed and having at least one powder outflow port 42 formed along the outer peripheral surface of the eccentric body, fixed shafts 46a and 46b fixed to both end parts of the eccentric plate, eccentrical rotating bodies 48a and 48b connected to the other ends of the rotating shafts 50a and 50b, rotating shafts 50a and 50b connected to the rotating bodies 48a and 48b, and a motor 52 rotating the rotating shaft 50a.