Image forming apparatus and developing cartridge

An image forming apparatus comprising:

• a main body including main body connectors;
• a cartridge tray including photosensitive drums, the cartridge tray being movable between a housed position where the cartridge tray is housed in the main body and a drawn-out position where the cartridge tray is drawn out from the main body;
• and
• cartridges mounted to the cartridge tray, each of the cartridges including a developing roller, a developing container containing toner, and a memory including a memory contact surface, wherein the cartridges are removable from the cartridge tray in a state where the cartridge tray is in the drawn-out position,
• wherein in a state where the cartridge tray is in the housed position, the memory contact surface faces upward and contacts one of the main body connectors, and each of the cartridges is movable between a contact position where the developing roller contacts one of the photosensitive drums and a separation position where the developing roller separates from one of the photosensitive drums while the one of the main body connectors and the memory contact surface contact each other.