Developing device, process cartridge, and image forming apparatus for forming an image on a recording medium using an electrophotographic method

A developing device used in an electrophotographic image forming apparatus, the developing device comprising:

• a developer bearing member configured to bear a developer and develop an electrostatic latent image;
• a supply member assembled in a frame, configured to supply the developer to the developer bearing member, to be arranged to form a nip portion between the supply member and the developer bearing member, and to rotate in a direction in which its surface moves from an upper end to a lower end of the nip portion;
• a containing unit configured to be arranged below the supply member in a vertical direction and contain the developer;
• and
• a conveyance member configured to be arranged in the containing unit,
• wherein the conveyance member is configured to rotate in a same direction as the supply member and convey the developer contained in the containing unit via a path between the supply member and the frame so as to be stored above the nip portion in the vertical direction.