Image forming apparatus with a process cartridge having subunits

摘要

The present invention provides an image forming apparatus (210) as well as a developing cartridge (240) for use in an image forming apparatus (210), wherein a contact plate of an electrode (247) of the developing cartridge (240) is disposed to contact a bias terminal (258) coupled to a first wall (251a) of a drum unit (250) when the developing cartridge (240) is installed in a developing cartridge installation portion (250a), and wherein a position (SP) where the electrode (247) contacts the bias terminal (258) when the developing cartridge (240) is installed in a developing cartridge installation portion (250a) is inside an outer shape of the driven coupling (248a1) when viewed in a direction of the developing roller shaft (244a).