A process cartridge configured to be mounted on a main body of an image forming apparatus in a detachable manner, the process cartridge including a side wall on a lateral side thereof, the side wall including a through hole and the process cartridge further including an outer cover member that encloses the side wall, the outer cover member having a surface substantially parallel to the side wall, the process cartridge including an image carrier configured to carry a toner image on a surface thereof; a cleaning unit adapted to clean the image carrier; a cleaning member configured to remove a residual toner from the image carrier remaining after transference of the toner image from the image carrier to a transfer medium; and a toner conveying unit (71, 74) configured to convey the residual toner removed by the cleaning member, wherein: the toner conveying unit comprises a toner conveying member configured to rotate along a rotation axis in order to convey the residual toner along the rotation axis in a predetermined direction; and a rotary supporting member configured to receive a rotational driving force through the image carrier so as to be rotatable along the rotation axis, one end of the rotary supporting member being directly coupled to the toner conveying member so as to convey the rotational driving force to the toner conveying member, other end of the rotary supporting member being provided with a shaft portion, the shaft portion being provided with a first positioning member at a first end thereof integrally formed with the shaft portion; and the outer cover member is provided with a second positioning member held at the outer cover member; the process cartridge further comprising a holder including a holding unit (52, 80) configured to pass through the through hole and held at the outer cover member in a rotatable manner, and the holder being provided with a third positioning member at one end and a fourth positioning member at other end thereof; wherein the first positioning member and the third positioning member engage with each other in a rotatable manner and the second positioning member and the fourth positioning member engage with each other in a rotatable manner; wherein the rotary supporting member includes a gear for rotationally driving the toner conveying member, the gear of the rotary supporting member is drivingly connected to a gear arranged at the image carrier through an idler gear arranged on the holder. the toner conveying unit comprises a toner conveying member configured to rotate along a rotation axis in order to convey the residual toner along the rotation axis in a predetermined direction; and a rotary supporting member configured to receive a rotational driving force through the image carrier so as to be rotatable along the rotation axis, one end of the rotary supporting member being directly coupled to the toner conveying member so as to convey the rotational driving force to the toner conveying member, other end of the rotary supporting member being provided with a shaft portion, the shaft portion being provided with a first positioning member at a first end thereof integrally formed with the shaft portion; and the outer cover member is provided with a second positioning member held at the outer cover member; the process cartridge further comprising a holder including a holding unit (52, 80) configured to pass through the through hole and held at the outer cover member in a rotatable manner, and the holder being provided with a third positioning member at one end and a fourth positioning member at other end thereof; wherein the first positioning member and the third positioning member engage with each other in a rotatable manner and the second positioning member and the fourth positioning member engage with each other in a rotatable manner; wherein the rotary supporting member includes a gear for rotationally driving the toner conveying member, the gear of the rotary supporting member is drivingly connected to a gear arranged at the image carrier through an idler gear arranged on the holder.