A position detection apparatus detects a position of a target object. One end of a swinging member contacts the target object, and the other end contacts a moving member. (M+1) pieces of sensors are arranged to output signals corresponding to a position of the moving member. Measured parts are disposed on the moving member along loci of measuring positions of the sensors. A detection unit detects the position of the target object based on the output signals of M pieces of sensors when the other sensor outputs a predetermined signal. The measured parts corresponding to the other sensor are provided in 2.sup.M pieces of divided areas that are disposed along a locus corresponding to the other sensor. Each of the measured parts corresponding to the other sensor is disposed in a center portion except both ends in the moving direction in each of the divided areas.

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.