Process cartridge

A process cartridge comprising:

• a photosensitive unit including a photosensitive member;
• and
• a developing unit configured to be attachable to and detachable from the photosensitive unit, the developing unit including
• a frame configured to store toner,
• a developing roller configured to carry the toner and be rotatable to convey the toner to the photosensitive member,
• a side seal configured to contact an end portion of the developing roller in a rotation axis direction of the developing roller and prevent the toner from leaking to outside through a gap between the developing roller and the frame, and
• a sealing sheet configured to contact a center portion of the developing roller in the rotation axis direction and prevent the toner from leaking to outside through a gap between the developing roller and the frame, wherein
• the frame includes a toner receiving portion, the toner receiving portion includes an opening facing the developing roller and is disposed on an upstream side of the side seal and a downstream side of a contact portion where the developing roller contacts the photosensitive member in a rotating direction of the developing roller, and moreover is disposed at a position overlapping with the side seal in the rotation axis direction of the developing roller,
• the frame has a mounting surface on which the side seal is mounted,
• the toner receiving portion has a concave portion that is recessed downward from the mounting surface in a gravitational direction, and
• a bottom portion of the toner receiving portion is located lower than the mounting surface in the gravitational direction in a posture when the process cartridge is in use.