Parts, and part supplying methods

An end member of a developing member for rotatably supporting one end of a developing roller of a process cartridge detachable with respect to an image forming apparatus, comprising:

• a sliding portion configured and positioned to rotatably support one end of the developing roller;
• a plurality of receiving portions which are disposed at positions different from said sliding portion and are supported by an end member adjacent to the lower side of said end member when a plurality of end members are stacked in a vertical direction;
• a plurality of abutment portions which are disposed at positions different from said sliding portion and support an end member adjacent to the upper side of said end member when a plurality of end members are stacked in the vertical direction,
• wherein the distance between one of said abutment portions and a corresponding one of said receiving portions is substantially the same for any pair of one abutment portion and a corresponding receiving portion;
• a first overlap portion that projects from an upper side of said end member and overlaps with a second overlap portion of the end member adjacent to the upper side of said end member when a plurality of end members are stacked in the vertical direction;
• and
• a second overlap portion that overlaps with a first overlap portion projecting from an upper side of the end member adjacent to the lower side of said end member when a plurality of end members are stacked in the vertical direction,
• wherein said sliding portion does not come into contact with the end member adjacent the upper side of said end member and the end member adjacent the lower side of said end member when a plurality of end members are stacked in the vertical direction.