An image forming apparatus includes: a frame; a plate including first and second electrical contact portions; and a developing cartridge detachably mountable to the frame. At least a portion of the first electrical contact portion is movable relative to the plate and separated farther from the plate than the second electrical contact portion The developing cartridge includes: a storage medium and a pressing portion. The storage medium includes first and second electrical contact surfaces. The pressing portion is configured to press the first electrical contact surface toward the first electrical contact portion to bring the first electrical contact surface into contact with the first electrical contact portion and to press the second electrical contact surface toward the second electrical contact portion to bring the second electrical contact surface into contact with the second electrical contact portion in a state where the developing cartridge is mounted to the frame.