Patent ID: 7676183

Claim:
A toner supply device, comprising: a toner container for storing toner, the toner container including an attachment portion and a positioning portion; and, a toner feed device having the toner container mounted thereon for feeding the toner supplied from the toner container to a developing unit, wherein the toner supplied from the toner container is fed to the developing unit after the toner has been agitated, wherein the toner feed device includes: a guide portion for guiding the attachment portion of the toner container when the toner container is mounted on the toner feed device; an engaging member in the form of a roller member having a circular cross-section, wherein the engaging member positions and holds the toner container by abutment with the positioning portion of the toner container, and wherein a rotational center of the roller member is located outside the position of abutment between the positioning portion and the roller member with respect to a width direction of the toner container; and a pressing member that holds the roller member and that presses the roller member against the positioning portion of the toner container.