An image forming device having a cleaning device that removes an adhered object on an endless belt body by contacting the endless belt body, which rotates while under tension. The endless belt body is formed with the following includes: an indentation Young's modulus is equal to or more than 5.5 GPa and is equal to or less than 10.0 GPa, and a specularity of a contacting surface that contacts the cleaning device is equal to or more than 50 and is equal to or less than 100.