Patent ID: 7877041

Claim:
An image forming apparatus comprising: an exposure unit that exposes an image bearing member by a laser beam; a first side plate and a second side plate facing with each other; a first support member, a second support member, and a third, support member connecting the first side plate and the second side plate to each other, and an exposure unit support member connecting the first side plate and the second side plate to each other without coming into contact with the first support member, the second support member, and the third support member, with the exposure unit being mounted to the exposure unit support member, wherein the first side plate and the second side plate and the first support member, the second support member, and the third support member form a substantially closed space, wherein a whole of said exposure unit is arranged in the closed space, and wherein a section of the closed space on a plane parallel to the first side plate and the second side plate has a substantially triangular shape.