Patent ID: 8849153

Claim:
A development device comprising: a regulation member defining a part of a developer room and configured to regulate the thickness of a developer layer on a developer carrier, the regulation member including a regulation edge facing the developer carrier to control the thickness of the developer layer on the developer carrier, and an end facing an inner wall surface of the developer room; a first seal member attached to the inner wall surface of the developer room at a position facing the end of the regulation member; and a second seal member attached to the regulation member at a portion in a vicinity of the end of the regulation member and being in contact with the first seal member to seal between the first seal member and the end of the regulation member, wherein the second seal member is lower in hardness than the first seal member, wherein the second seal member includes a bonded area that is bonded to the regulation member and an unbounded area that is not bonded to the regulation member.