Patent ID: 8068767

Claim:
An image forming apparatus comprising: a drum cartridge comprising a photosensitive drum and a drum drive input member into which drum driving force for rotating the photosensitive drum is inputted; a developing cartridge that is configured to be movably mounted to the drum cartridge, the developing cartridge comprising a developing roller disposed so as to face the photosensitive drum and a developing drive input member into which developing driving force for rotating the developing roller is inputted; a drum drive transmission member that is configured to engage with the drum drive input member and configured to transmit the drum driving force to the drum drive input member while permitting a positional gap of the drum drive input member within a predetermined range; and a developing drive transmission member that is configured to engage with the developing drive input member and configured to transmit the developing driving force to the developing drive input member while permitting a positional gap of the developing drive input member within a predetermined range.