An image forming apparatus includes a first unit that is movable to a first inside position of the main assembly. The first unit includes a first shutter provided with a first contacting portion. The apparatus also includes a second unit movable to a second inside position of the main assembly. The second unit includes a second shutter provided with a second contacting portion. The main assembly includes a first contacted portion causing the first shutter to move from a first position toward a second position by contacting of the first contacting portion while moving the first unit to the first inside position, and a second contacted portion causing the second shutter to move from a third position toward a fourth position by contacting of the second contacting portion while moving the second unit to the second inside position.