A developer container storage apparatus includes a storage portion, a door, a locking member, a lock urging portion, a driving source, a rotation shaft, a cylindrical sleeve, and an engage portion. When the door is in the close state, the rotation shaft is located at the engage position, and if the rotation shaft rotates, the engage portion switches the locking member from the first position to the second position so that the door is made unlockable in the close state. When the door is in an open state, the rotation shaft is located at the disengage position, and the lock urging portion switches the locking member from the second position to the first position so that the door is made lockable in the close state.