ENDLESS BELT AND IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To provide an endless belt in which an area having high strength is configured by a single member.SOLUTION: An annular member 510 has deviation in the distribution of carbon black 512, on a first surface 510a. Concretely, the annular member 510 has an area A1 which includes an end portion 510c, and an area A2 in which the content of carbon black 512 per unit volume is higher than that of the area A1, on the first surface 510a. In the annular member 510, the end portion 510c is reinforced without forming a groove or projections/depressions on the first surface 510a. The annular member 510 is a single member having a further high strength area.