Image forming apparatus

An image forming apparatus configured to form an image onto a recording medium, the image forming apparatus comprising:

• an apparatus main body;
• a plurality of drum shafts supported by the apparatus main body;
• a plurality of drum cartridges where each drum cartridge includes a photosensitive drum and is insertable and removable in an axial direction of a corresponding one of the plurality of drum shafts;
• a regulation side plate which includes a plurality of bearings configured to support end portions of the plurality of drum shafts opposite to end portions of the plurality of drum shafts supported by the apparatus main body, and is to be fixed to the apparatus main body;
• a cam including a first contact surface and a second contact surface;
• an operation portion configured to rotatably operate the cam;
• a shaft which is rotatably provided to the regulation side plate, and to which the operation portion and the cam are fixed;
• a contact portion which is provided to the apparatus main body, and is configured to be brought into contact with the first contact surface and the second contact surface of the cam by rotation of the cam along with an operation of the operation portion;
• a projecting portion provided to one of the regulation side plate and the apparatus main body;
• a fitting portion which is provided to another one of the regulation side plate and the apparatus main body, and is to be fitted to the projecting portion;
• and
• an urging force imparting portion which is provided at each of both end portions of the regulation side plate in an array direction of the plurality of bearings, and is configured to impart, to the regulation side plate, an urging force that urges the regulation side plate toward the apparatus main body in a state in which the second contact surface is in contact with the contact portion by the operation portion being rotated by a user,
• wherein at least a part of the urging force imparting portion is provided at a position for imparting the urging force on, with respect to the plurality of bearings, a side opposite to a position at which one of the projecting portion and the fitting portion is provided, in a direction orthogonal to the array direction of the plurality of bearings and the axial direction of each of the plurality of drum shafts.