A process cartridge of an image forming apparatus includes a seal member to seal a first gap between an end portion of a developer bearing member and a frame, and a sealing portion that seals a second gap between the frame and an end portion of the seal member. The frame includes an injection inlet through which elastomer has been injected into the second gap for forming the sealing portion, a storage portion that is a space surrounded by a second surface of the frame and a wall protruding from the second surface and in which elastomer spilling out of the second gap is stored, and a protruding portion that protrudes, from the second surface of the frame, further than the wall of the storage portion. The protruding portion contacts a conveyed recording medium when the process cartridge is mounted in an apparatus main body of the image forming apparatus.