To provide a part feeder for projection nuts, which efficiently discharges faced-up nuts and surely eliminates faced-down nuts.

A guide part 19 for locking a projection 6 for weld-bonding of the faced-up nut is formed in a part carrying route 15 tilted in a predetermined direction. An inverting mechanism part 23 for inverting the faced-down nut 1 slidingly falling down from the guide part 19 and returning it to the part carrying route 15 is formed along the outer peripheral side or inner peripheral side of the guide part 19. The faced-down nut 1 falling from the guide part 19 is immediately inverted into the faced-up nut at the inverting mechanism part 23, and all nuts 1 transferred to the part carrying route 15 are efficiently discharged in a faced-up state.