| 摘要 |
A driving force transmission mechanism (40) includes: a first support portion (31) for supporting an end portion of a rotation shaft (1aa) of a photosensitive drum (1a) on a second driving force transmission gear (49) side; a second support portion (33) arranged opposite to the photosensitive drum (1a) across the first support portion (31); a shaft (51) provided so as to protrude from the second support portion (33) to the photosensitive drum (1a) side; and a multi-step gear (47) rotatably supported by the shaft (51), the multi-step gear including a driving force input gear portion (47a) and a driving force output gear portion (47b). Between the driving force input gear portion (47a) and the driving force output gear portion (47b), there is formed a peripheral surface portion (47c) rotatably supported by a bearing member (53) provided into a second through-hole (31a) of the first support portion (31).
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