An image forming apparatus includes a toner replenishing portion, a waste toner collecting portion, and a toner container. The toner container is attachable to the toner replenishing portion and the waste toner collecting portion. The toner container includes a first lever switchable between first and second positions, and a second lever switchable between third and fourth positions. The toner replenishing portion includes a first actuating portion configured to, while the toner container is being attached to the toner replenishing portion, prohibit an attachment of the toner container, and a second actuating portion configured to switch the second lever to the fourth position. The waste toner collecting portion includes a third actuating portion configured to, while the toner container is being attached to the waste toner collecting portion, prohibit an attachment of the toner container, and a fourth actuating portion configured to switch the first lever to the second position.