Provided is an image forming apparatus including: an image bearing member which is configured to bear a toner image; an intermediate transfer belt; a transfer roller; a drive roller; a driven roller; a meandering prevention pulley; and a meandering prevention belt. The meandering prevention pulley is arranged to face an end surface of the driven roller in an axial direction of the driven roller. The meandering prevention belt is arranged on an outside in the axial direction relative to the meandering prevention pulley, and protrudes from an inner peripheral surface of the intermediate transfer belt. The meandering prevention pulley has a guide surface which faces the meandering prevention belt in the axial direction, and which is formed to have a surface roughness (Ra) of 0.5 m or more.

A belt tracking system for controlling the lateral position of a movable belt entrained about a plurality of generally parallel rollers for moving in a trans-axial direction perpendicular to an axial direction in which the rollers extend parallel to each other includes a roller shaft, a slidable member, and a rotation restrictor. The roller shaft extends outward in the axial direction from an axial end of a specific one of the plurality of generally parallel rollers. The slidable member is slidably disposed around the roller shaft to move along the roller shaft as the belt moves laterally outward in the axial direction. The rotation restrictor is disposed adjacent to the slidable member to restrict rotation of the slidable member around the roller shaft.

In the fixing device according to the present invention, a relationship D>R+CF is satisfied where F is a width of a film. C is a width of a conductive layer. R is a distance between two restriction surfaces, and D is a width of a pressure member.