Image forming apparatus having improved structure for fixing an exposure unit to a frame

An image forming apparatus comprising:

• an image bearing member configured to rotate;
• a pair of side plates disposed at both end sides of the image bearing member in a rotation-axis direction of the image bearing member;
• a frame member including a support surface and made of metal, the frame member being supported by the pair of side plates;
• an exposure unit configured to emit a laser beam to a surface of the image bearing member and form an electrostatic latent image thereon, the exposure unit being disposed such that when viewed in the rotation-axis direction of the image bearing member, an emission direction in which the laser beam is emitted to the image bearing member is inclined with respect to the support surface, the exposure unit including a first supported portion and a second supported portion;
• support members including a first support member made of metal and a second support member made of metal, wherein the first support member and the second support member abut against the frame member, and the first support member contacts the first supported portion and the second support member contacts the second supported portion so that the exposure unit is in an inclined posture with respect to the support surface;
• and
• a positioning member made of resin and configured to be in contact with the exposure unit and position the exposure unit,
• wherein the support surface of the frame member is in contact with at least one of the support members or the positioning member, and
• wherein the exposure unit is configured to be attached to the frame member via the support members and the positioning member.