Cartridge and developing cartridge including a frame and sheet member provided at end side of the frame

A cartridge comprising:

• a photosensitive member unit including a photosensitive drum;
• a developing unit detachably mounted to the photosensitive member unit, the developing unit including:
• a frame in which an opening portion is formed;
• an accommodating portion provided inside of the opening portion and configured to accommodate toner;
• a rotatable developing member disposed so as to be exposed outside of the opening portion and configured to bear the toner;
• a supplying roller contacting the developing member and configured to supply the toner accommodated in the accommodating portion to the developing member via the opening portion;
• a stirring member including a rotation shaft and a first sheet member provided on the rotation shaft, the stirring member being configured to rotate to stir the toner accommodated in the accommodating portion;
• a regulating member contacting the developing member and configured to regulate thickness of a layer of the toner borne on a surface of the developing member;
• a second sheet member provided only on an end side of the frame with respect to a rotational axis direction of the developing member, the second sheet member including a portion opposing a surface of the developing roller that is exposed to outside of the opening portion, the portion being disposed and fixed to the frame in a state of not contacting the developing member;
• and
• a storage portion capable of storing the toner between the second sheet member and a position where the developing member and the supplying roller contact in a cross section that is perpendicular to the rotational axis direction.