A unit comprising: a photosensitive element; a cleaning blade arranged to extend substantially parallel to a direction of length of the photosensitive element so as to contact the photosensitive element or to keep a predetermined distance from the photosensitive element, wherein the photosensitive element includes an image carrier configured to carry a toner image on a surface of the photosensitive element, and the cleaning blade is configured to clean residual toner remaining on the surface of the image carrier after an image transfer process; and a frame to which the image carrier and the cleaning blade are installed, wherein the frame is made of resin, wherein the frame includes an image carrier positioning unit configured to position the image carrier at a predetermined position; and a cleaning blade positioning unit configured to position the cleaning blade at a predetermined position, characterized in that the cleaning blade positioning unit (227, 257) is a projecting portion projecting from a first blade contact surface of the frame extending in a length direction, wherein the image carrier positioning unit and the cleaning blade positioning unit are formed with the same mold, wherein the cleaning blade positioning unit includes a supporting surface supporting the cleaning blade without moving the cleaning blade in a direction of gravity, wherein the supporting surface is parallel to a moving direction of the mold. a photosensitive element; a cleaning blade arranged to extend substantially parallel to a direction of length of the photosensitive element so as to contact the photosensitive element or to keep a predetermined distance from the photosensitive element, wherein the photosensitive element includes an image carrier configured to carry a toner image on a surface of the photosensitive element, and the cleaning blade is configured to clean residual toner remaining on the surface of the image carrier after an image transfer process; and a frame to which the image carrier and the cleaning blade are installed, wherein the frame is made of resin, wherein the frame includes an image carrier positioning unit configured to position the image carrier at a predetermined position; and a cleaning blade positioning unit configured to position the cleaning blade at a predetermined position, characterized in that the cleaning blade positioning unit (227, 257) is a projecting portion projecting from a first blade contact surface of the frame extending in a length direction, wherein an image carrier positioning unit configured to position the image carrier at a predetermined position; and a cleaning blade positioning unit configured to position the cleaning blade at a predetermined position, characterized in that the cleaning blade positioning unit (227, 257) is a projecting portion projecting from a first blade contact surface of the frame extending in a length direction, wherein the image carrier positioning unit and the cleaning blade positioning unit are formed with the same mold, wherein the cleaning blade positioning unit includes a supporting surface supporting the cleaning blade without moving the cleaning blade in a direction of gravity, wherein the supporting surface is parallel to a moving direction of the mold.