A lever member is displaceably provided to a toner container. A container locking mechanism locks the toner container at a mounting position in a container mounting portion when the lever member is operated from a first operation position to a second operation position in a state where the toner container is located at the mounting position. A locking member is displaceable between a lever locking position and a lever releasing position. A locking control portion controls a drive portion to displace the locking member to the lever locking position when a remaining amount of the toner detected by the remaining amount detection portion is equal to or greater than a predetermined amount, and controls the drive portion to displace the locking member to the lever releasing position when the remaining amount of the toner detected by the remaining amount detection portion is less than the predetermined amount.