| 摘要 |
A drum unit has a photosensitive drum, a circular tube member, a housing, and a bearing portion. The photosensitive drum includes a drum sleeve, a flange portion, and a supporting portion. The supporting portion is press-fitted into the inner peripheral surface of the circular tube member made of metal. The sliding surface of the circular tube member is rotatably inserted into the bearing portion attached to the housing of the drum unit.
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