Patent ID: 8126373

Claim:
A toner supply device, comprising: a toner container configured to store toner; a transport-path forming member configured to form a transport path to transport the toner stored in the toner container to the outside of the toner container; an opening provided at a side wall of the transport-path forming member; a shutter member movable between a closed position to close the transport path by being inserted in the opening and an open position to open the transport path; and a first seal member configured to fill a gap between an inner wall of the opening and the shutter member in a toner transport direction in which the toner is transported through the transport path, wherein, when the shutter member is inserted in the opening, the shutter member is elastically deformable in a deformation direction perpendicular to both the toner transport direction and a moving direction of the shutter member, the shutter member being wider than the opening in the deformation direction when the shutter member is not inserted in the opening.