Developing device and cartridge

A cartridge detachably mountable to a main assembly of an image forming apparatus, said cartridge comprising:

• a developing container for accommodating a developer;
• a developer carrying member, provided rotatably in said developing container, for carrying and feeding the developer to develop an electrostatic image;
• a developer feeding member, including an elastic feeding portion and being rotatably provided in said developing container, for feeding the developer in said developing container toward said developer carrying member;
• and
• a circulation changing member for changing circulation of the developer in the neighborhood of said developer carrying member, wherein in a plane perpendicular to a rotational axis of said developer carrying member, said circulation changing member being provided in a maximum rotation area of said developer feeding member so as to create a gap between itself and an entire inner surface of said developing container and a gap between itself and said developer carrying member.