Patent ID: 8326179

Claim:
A tandem type photosensitive unit comprising: a plurality of photosensitive drums provided in parallel with each other; first and second side plates provided on a first side and a second side of the photosensitive drums in an axial direction of the photosensitive drums, respectively, so as to oppose each other, the first side plate being formed with a first through hole at a position opposing each photosensitive drum in the axial direction, the second side plate being formed with a second through hole at a position opposing each photosensitive drum in the axial direction; a first bearing member fitted into each of the first through holes and supporting a first end portion of the corresponding photosensitive drum at the first side; and a second bearing member fitted into each of the second through holes and supporting a second end portion of the corresponding photosensitive drum at the second side, wherein an inner surface of each of the through holes has four linear portions, wherein the four linear portions are in contact with a virtual circle virtually set in the corresponding through hole, and arranged at a regular angular interval with respect to a center of the virtual circle, and wherein each of the first and second bearing members includes an insertion portion which has an outer peripheral surface having a diameter larger than that of the virtual circle, and is inserted into the corresponding through hole.