| 摘要 |
A tandem type photosensitive unit includes a plurality of drum retaining units arrayed in line in an arraying direction, and a pair of side plates arranged on both sides of the drum retaining units in an axial direction perpendicular to the arraying direction and collectively opposed to the drum retaining units. Each drum retaining unit retains a photosensitive drum having an axis which extends in the axial direction. At least one of the side plates is provided to be slidable in the axial direction.
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