Patent ID: 8774650

Claim:
A rotary developing device configured to rotate about a rotational axis, the rotary developing device comprising: a plurality of developing units each configured to develop a latent image formed on a surface of an image holding member into a visible image and rotatable about the rotational axis so as to be sequentially movable to a developing position facing the image holding member; an energized member supported in a developing unit among the developing units; a hollow cylindrical unit having a space therein, the hollow cylindrical unit being arranged along the rotational axis and fixed so that a rotatable unit rotates about the fixed hollow cylindrical unit; a first energizing member supported on an outer periphery of the hollow cylindrical unit; the rotatable unit supported rotatably with respect to the hollow cylindrical unit and rotating together with the rotary developing device; a second energizing member supported by the rotatable unit, the second energizing member including a contact portion that comes into contact with the first energizing member; a first conductive member having an end connected to the first energizing member and another end lead out to outside the developing device through the space in the hollow cylindrical unit; a second conductive member that connects the second energizing member to the energized member; and a replenishing device supported integrally with the developing units so as to be rotatable about the rotational axis, the replenishing device being configured to transport a developer to be replenished to each of the developing units, the replenishing device including a plurality of replenishing units each provided for one of the developing units, the plurality of replenishing units being arranged in an axial direction of the rotational axis, wherein the hollow cylindrical unit is arranged so as to extend through the rotational axis of the replenishing device.