In a powder charging apparatus according to the present invention, powder is delivered to a delivery tube using delivery air, and an external drive voltage is applied to a vibrator to vibrate the surface of the vibrator. The powder is dispersed around the vibrator when the powder passes through an enlarged diameter portion, and the powder is subjected to vibration from the surface of the vibrator. Thus, each powder particle passes through the enlarged diameter portion while repeatedly colliding against the surface of the vibrator and the inner wall surface of the enlarged diameter portion, which are electrification members. At this time, the surface of the vibrator and the inner wall surface of the enlarged diameter portion charge the powder particles by contact.