Developing apparatus

A developing apparatus for use in an image forming apparatus, the developing apparatus comprising:

• a developing frame configured to accommodate a developer;
• a developing member configured to bear the developer and be rotatable;
• a regulation blade configured to regulate the developer borne on a surface of the developing member, wherein the regulation blade is fixed to the developing frame;
• and
• a seal member configured to prevent the developer from leaking outside the developing frame,
• wherein the regulation blade includes:
• a support plate extending in a rotational axis direction of the developing member;
• a plate-shaped member having one end portion and other end portion in a direction intersecting with the rotational axis direction, wherein the one end portion faces the developing member and the other end portion is supported by the support plate, and
• a regulation member configured to regulate the developer borne on the surface of the developing member, wherein the regulation member is fixed to a facing surface of the plate-shaped member facing the developing member at the one end portion, is in contact with the developing member, and is formed inside an end portion of the plate-shaped member in the rotational axis direction,
• wherein the seal member is fixed to the facing surface of the plate-shaped member, is arranged at the end portion of the plate-shaped member, is arranged side by side with the regulation member in the rotational axis direction, is in contact with an end surface of the regulation member, and is disposed between the plate-shaped member and the developing member in the direction intersecting with the rotational axis direction, and
• wherein the plate-shaped member is welded to a region of the support plate excluding a region outside the end surface of the regulation member in the rotational axis direction.