A positioning member has a positioning surface that abuts an inner peripheral surface of an intermediate transfer belt to perform the positioning of the intermediate transfer belt with respect to a density detection sensor and a cleaning surface coated with a cleaning member having hardness lower than that of the positioning surface and abutting the inner peripheral surface of the intermediate transfer belt via the cleaning member. When a correction process is performed by a density correction section, the positioning surface of the positioning member 36 abuts the inner peripheral surface of the intermediate transfer belt, and when the correction process is not performed by the density correction section, the cleaning surface of the positioning member abuts the intermediate transfer belt.