Patent ID: 8655198

Claim:
An image forming apparatus comprising: an image forming unit to form an image on an image bearer; a toner container mount into which first and second toner containers for containing toner are removably insertable horizontally, the second toner container greater than the first toner container in a cross section perpendicular to a direction of insertion of the first and second toner containers, the first and second toner containers each including guided portions projecting laterally on the cross section perpendicular to the direction of insertion of the first and second toner containers, the guided portions positioned at a lower portion of the first and second containers, container guides formed in the toner container mount configured to guide the guided portions of the first and second toner containers inserted into the toner container mount, respectively; and an insertion opening forming member positioned at an entrance of the toner container mount, defining first and second insertion openings through which the first and second toner containers are respectively inserted, the second insertion opening greater than the first insertion opening, wherein the first and second insertion openings include laterally projecting portions to fit the guided portions of the first and second toner containers, respectively, the laterally projecting portion of the first insertion opening has a vertical length longer than that of the laterally projecting portion of the second insertion opening, and the guided portion of the first toner container has a vertical length longer than that of the guided portion of the second toner container.