Intermediate transfer device and image forming apparatus including frame members

1. An intermediate transfer device comprising:

an endless intermediate transfer member to which a plurality of developer images in different colors are transferred so as to overlap one another by a first-transfer unit;

a plurality of intermediate transfer member support members that support the intermediate transfer member so that the intermediate transfer member rotates in a circumferential direction;

two frame members respectively disposed at two ends of the intermediate transfer member in a width direction of the intermediate transfer member, the two frame members supporting two ends of each of the intermediate transfer member support members; and

first and second positioning members respectively disposed at two positions on each of the frame members with a distance therebetween, each of the first and second positioning members including a positioning portion that performs positioning by pressure-contacting an apparatus body when the intermediate transfer device is mounted in the apparatus body,

wherein at least one of the frame members satisfies a condition L 1 :L 2 =2.85:x (0≦x≦1), where L 1 is a length of a line segment connecting an intersection point to the positioning portion of one of the first and second positioning members that is located on a side opposite to a side toward which a line of action of a force applied to the at least one of the frame members is inclined and L 2 is a length of a line segment connecting the intersection point to the positioning portion of the other of the first and second positioning members that is located on the side toward which the line of action is inclined, the intersection point being an intersection of the line of action and a line segment connecting the two positioning portions to each other, the force being applied by a second-transfer unit that transfers the developer images on the intermediate transfer member to a recording medium by pressing one of the intermediate transfer member supporting members with the intermediate transfer member therebetween.

2. An image forming apparatus comprising:

a plurality of electrostatic latent image carriers provided so as to correspond to a plurality of colors, the electrostatic latent image carriers carrying electrostatic latent images formed on the basis of image information;

a plurality of developing units provided so as to correspond to the plurality of electrostatic latent image carriers, the developing units developing the electrostatic latent images formed on surfaces of the electrostatic latent image carriers into developer images by using developers;

the intermediate transfer device according to claim 1 ;

a plurality of first-transfer units provided so as to correspond to the plurality of electrostatic latent image carriers, the first-transfer units transferring the developer images on the electrostatic latent image carriers to the intermediate transfer member so as to overlap one another;

the second-transfer unit that transfers the developer images on the intermediate transfer member to the recording medium; and

a fixing unit that fixes the developer images, which have been transferred to the recording medium, to the recording medium.