IMAGE FORMING APPARATUS

An image forming apparatus includes: a developing cartridge; a drum cartridge to which the developing cartridge is detachably attachable; and a main frame. The developing cartridge includes: a casing; a first electrical contact surface; and a first holder holding the first electrical contact surface and movable relative to the casing. The drum cartridge includes: a drum frame; a second electrical contact surface; and a second holder holding the second electrical contact surface and movable relative to the drum frame. The main frame includes: a guide frame for guiding attachment of the drum cartridge to which the developing cartridge is attached; and first and second main electrical contacts. The first main electrical contact can be electrically connected to one of the first and second electrical contact surfaces. The second main electrical contact can be electrically connected to a remaining one of the first and second electrical contact surfaces.