Developing device with seal members

A developing device comprising:

• a developing roller;
• a frame including a developer storage portion configured to store developer, and a developer supply opening in communication with the developer storage portion and extending along an axial direction of the developing roller;
• and
• a seal member configured to seal between the frame and an outer peripheral surface of the developing roller, the seal member being provided on the frame and extending along the axial direction of the developing roller,
• wherein the frame has a seal supporting surface extending along the axial direction of the developing roller, on which the seal member is supported in a cantilevered fashion,
• wherein the seal member comprises a sheet-like member and an elastic adhesive member having elasticity, and the elastic adhesive member extends along a longitudinal edge of the developer supply opening, which longitudinal edge extends along the axial direction of the developing roller, and the sheet-like member has one end portion fixed to the seal supporting surface through the elastic adhesive member and the other end portion in contact with the outer peripheral surface of the developing roller, and
• wherein the elastic adhesive member has a first surface adhered to the sheet-like member and a second surface adhered to the seal supporting surface, and at least one slit is formed in the elastic adhesive member along the axial direction of the developing roller from the second surface toward the first surface.