Patent ID: 7006775

Claim:
An image forming apparatus comprising: a plurality of developing devices capable of developing an electrostatic image on an image bearing member at a developing position; a developing device moving apparatus for holding the plurality of developing devices and selectively moving one of the plurality of developing devices to the developing position; a connecting portion disposed on an apparatus main body for electrically connecting a developing device located at the developing position to the apparatus main body; and to-be-connected portions disposed to the plurality of developing devices, respectively, and electrically connected by coming into contact with the connecting portion, wherein any one of the connecting portion and the to-be-connected portions has an electrically conductive rotary member which is rotated by being in contact with the other of them when moving the developing device toward the developing portion, and wherein the rotary member is electrically connected by coming into contact with the other of them in a state that the rotary member stops, when the developing device located at the developing position executes a developing operation.