A manufacturing method for manufacturing an image bearing unit from a cartridge (B), the cartridge (B) including: an image bearing member ; a frame including a first engaged portion ; a supporting member including a fixed portion fixed to the frame , the supporting member including a bearing portion that supports the image bearing member , the supporting member including a second engaged portion opposed to the first engaged portion , and the image bearing member being supported by the bearing portion rotatably around an axis; and a developing unit including an engaging portion , the engaging portion engaging with the first engaged portion and the second engaged portion such that the developing unit being swingably coupled to the frame , the manufacturing method comprising: a dividing step for dividing the supporting member into a first divided portion including the fixed portion and a second divided portion including the second engaged portion ; a divided-portion detaching step for detaching the second divided portion from the frame ; and a separating step for detaching the engaging portion from the first engaged portion and separating the developing unit from the frame . the cartridge (B) including: an image bearing member ; a frame including a first engaged portion ; a supporting member including a fixed portion fixed to the frame , the supporting member including a bearing portion that supports the image bearing member , the supporting member including a second engaged portion opposed to the first engaged portion , and the image bearing member being supported by the bearing portion rotatably around an axis; and a developing unit including an engaging portion , the engaging portion engaging with the first engaged portion and the second engaged portion such that the developing unit being swingably coupled to the frame , an image bearing member ; a frame including a first engaged portion ; a supporting member including a fixed portion fixed to the frame , the supporting member including a bearing portion that supports the image bearing member , the supporting member including a second engaged portion opposed to the first engaged portion , and the image bearing member being supported by the bearing portion rotatably around an axis; and a developing unit including an engaging portion , the engaging portion engaging with the first engaged portion and the second engaged portion such that the developing unit being swingably coupled to the frame , the manufacturing method comprising: a dividing step for dividing the supporting member into a first divided portion including the fixed portion and a second divided portion including the second engaged portion ; a divided-portion detaching step for detaching the second divided portion from the frame ; and a separating step for detaching the engaging portion from the first engaged portion and separating the developing unit from the frame . a dividing step for dividing the supporting member into a first divided portion including the fixed portion and a second divided portion including the second engaged portion ; a divided-portion detaching step for detaching the second divided portion from the frame ; and a separating step for detaching the engaging portion from the first engaged portion and separating the developing unit from the frame . <EOS>