Process cartridge

A process cartridge comprising:

• a photosensitive member unit;
• and
• a developing unit that is attachable to and detachable from the photosensitive member unit,
• wherein the photosensitive member unit includes:
• a photosensitive drum on which an electrostatic latent image is formed;
• a frame that supports the photosensitive drum;
• and
• a pressing member that presses the developing unit toward the photosensitive member unit,
• the developing unit includes:
• a developing roller that supplies toner to the photosensitive drum and collects the toner remaining on a surface of the photosensitive drum;
• a housing in which a holding space that holds the toner is formed;
• and
• a pressing receiving portion that receives pressing force from the pressing member,
• the housing includes:
• a first bottom portion that has an arc shape and that projects toward an outer side of the holding space;
• a second bottom portion that has an arc shape and that projects toward the outer side of the holding space;
• a first top surface;
• a second top surface provided upward of the first top surface in a gravitational direction, in a state in use;
• and
• a connecting portion that connects the first top surface and the second top surface, and
• the connecting portion has an opposing surface opposite the first top surface.