Patent ID: 7657206

Claim:
An image forming apparatus comprising: a casing; a plurality of image carriers parallelly arranged along one direction in the casing, and configured to have an electrostatic latent image formed thereon; a plurality of developing agent carriers opposed to the image carriers, and configured to feed developing agent to the image carriers having the electrostatic latent image formed thereon; and a plurality of developing agent cartridges, parallelly arranged in the one direction to be opposed to the developing agent carriers in the longitudinal direction of the developing agent carriers, and configured to be together attachable/detachable to/from the casing along the one direction, for accommodating the developing agent fed to the developing agent carriers, wherein the developing agent cartridge is formed with a feed-side opening for feeding the developing agent, on a position opposed to the developing agent carrier, and a feed-side shutter is provided for covering the feed-side opening in an openable/closable manner each developing agent cartridge is formed with a return-side opening for receiving the developing agent, on a position opposed to the developing agent carrier, and a return-side shutter is provided for covering the return-side opening in an openable/closable manner.