Developing apparatus and process cartridge

A process cartridge detachable from an image forming apparatus main body, the process cartridge comprising:

• an image bearing member on which an electrostatic image is formed;
• a developer bearing member configured to rotate while supporting developer to develop the electrostatic image;
• a supporting portion having a concave portion that is formed into a concave shape in a direction perpendicular to a rotational axis direction of the developer bearing member and configured to support the developer bearing member rotatably and movably in the rotational axis direction inside the concave portion;
• an urging unit configured to urge the developer bearing member in a predetermined direction of the rotational axis direction;
• and
• a movement regulating member fitted to an end of the developer bearing member is configured to be movable together with the developer bearing member, and is configured to be movable to a first position where movement in a perpendicular direction to the rotational axis direction is regulated by coming into contact with a portion of the supporting portion and a second position that is a position apart from the first position in a direction opposite to the predetermined direction and movable in the perpendicular direction without coming into contact with the portion of the supporting portion.