Patent ID: 8081897

Claim:
A developing device, comprising: a seal member that covers a space between a casing of the developing device and a developing roller such that developer in the developing device does not leak, the space extending in a longitudinal direction of the developing roller, the seal member having a first end and a second end, the first end being fixed to the casing and extending along the longitudinal direction, and the second end extending along the longitudinal direction and coming into contact with the developing roller via a layer of developer, the seal member including: a flexible sheet that extends from the first end to the second end; and a reinforcing member attached to the sheet at an attachment surface between the reinforcing member and the sheet, the reinforcing member being located near the first end, the reinforcing member including a plurality of notches extending from the attachment surface in a direction perpendicular to the longitudinal direction and into an end of the reinforcing member that is closer to the second end.