An image forming apparatus may include a moving unit configured to support a cartridge and to slide in a generally horizontal direction between multiple positions. For example, the positions may include a first position where the moving unit is located inside the main body and a second position where the moving unit is located outside the main body. Additionally or alternatively, the moving unit being may also move between the first position and a third position located below the first position. The moving unit may also be configured to electrically connect electrodes based on its movement.