An image forming apparatus includes image forming units which are detachably mounted on an apparatus body, and each of which includes an image holding body and a developing unit provided with a developing member that supplies a developer to the electrostatic latent image formed on the surface of the image holding body, shaft members which rotatably support the developing units, urging members which urge the developing members toward the image holding bodies, supply devices which supply developers to the developing units, transport passages which are provided so as to extend toward the developing members and the image holding bodies, and elastic members which form a part of the transport passage and are extensibly deformed so as to absorb the deviation of the relative position between the supply port and the receiving port.