An image forming apparatus includes a drawer, a first drum cartridge having a first shutter, a second drum cartridge having a second shutter and a shutter driving member. In a state in which the shutter driving member is positioned at a first positon, the first shutter is positioned at a first closed position at which a first discharging outlet of the first drum cartridge is close and the second shutter is positioned at the second closed position at which a second discharging outlet of the second drum cartridge is close. In a state in which the shutter driving member is positioned at the second position, the first shutter is positioned at a first open position at which the first discharging outlet is open and the second shutter is positioned at a second open position at which the second discharging outlet is open.