Patent ID: 7684728

Claim:
An image forming apparatus, comprising: a casing; a process unit configured to be removably installed in the casing; a plurality of image carrier holder units arranged in a first direction, each image carrier holder unit configured to be held in the process unit; and a plurality of developing cartridges provided in correspondence with the image carrier holder units, the developing cartridges being configured to be removably mounted in the image carrier holder units; wherein each image carrier holder unit includes: an image carrier; a charger configured to charge the image carrier; a pair of side frames disposed so as to hold the image carrier therebetween; a center frame disposed between the side frames, the center frame being configured to support the charger; and a first support portion disposed on the center frame, and wherein each developing cartridge includes: a developer frame; a developer carrier provided in the developer frame; and a supported portion provided in the developer frame, the supported portion configured to face the first support portion when the developing cartridge is mounted in the image carrier holder unit.