Image forming apparatus and unit having mechanism for aligning first and second fit parts

An image forming unit capable of being used for an image forming apparatus, the image forming apparatus comprising an apparatus body, a cover capable of opening or closing an opening of the apparatus body, an exposure device attached to the cover, a second fit part provided at the exposure device, and the image forming unit accommodated in the apparatus body, the image forming unit comprising:

• an image carrier;
• a support configured to support the image carrier to be rotatable;
• a first fit part provided at the support and configured to fit to the second fit part in a state where the cover is closed with respect to the apparatus body;
• a mechanism configured to, as the exposure device approaches closer to the image forming unit upon closing the cover, make a first reference line of the first fit part closer to a second reference line of the second fit part by changing the inclination of the first fit part,
• wherein the mechanism includes:
• a base member rotatable with respect to the image forming unit and formed with the first fit part;
• a bias member configured to bias the base member to rotate in a first rotational direction;
• and
• an intervening member configured to be pushed by a contact part formed at the exposure device, pushing the base member to rotate in a second rotational direction opposite to the first rotational direction, against the bias member, as the exposure device gets closer to the image forming unit.