Patent ID: 7769320

Claim:
An image forming apparatus comprising: a casing that includes a pair of main-body side plates; a shaft that extends in an axial direction and is sandwiched between the pair of main-body side plates; a pair of pressing mechanisms that is provided in one-to-one correspondence on the pair of main-body side plates, each of the pair of pressing mechanisms including: a swing shaft that protrudes from the main-body side plate; a pressing arm that has a first end and a second end, the first end being swingably supported by the swing shaft; and a spring member that has a third end and a fourth end, the third end being linked to the second end of the pressing arm, the fourth end being fixed to the main-body side plate; and a photosensitive-member unit detachably mounted on the casing in a mounting direction orthogonal to the axial direction, the photosensitive-member unit including: a plurality of photosensitive members that is arranged in the mounting direction, each photosensitive member being rotatable about an axis which extends in the axial direction, each photosensitive member having two ends in the axial direction; and a pair of side plates that face each other in the axial direction, each side plate having a front end and a rear end, the front end being formed of a notched portion which contacts the shaft, each side plate including a positioning portion that protrudes from the rear end and contacts the pressing arm.