To provide an intermediate transfer body capable of preventing the occurrence of a crack on a surface layer even when being hung with a roll small in diameter by decreasing load on the surface layer by reducing stretching of the surface layer, and to provide an image forming device using the intermedi ate transfer body.

The ratio (DIS) of the thickness S of an elastic layer consisting of at least one layer provided on the base layer to the thickness S of a base layer consisting of at least one layer of the intermediate transfer belt 4 being the intermediate transfer body to is defined as 0.1 to 1. Thus, stretching of the surface layer can be reduced, the load on the surface layer can be decreased and the occurrence of the crack on the surface layer can be prevented even when the intermediate transfer body is hung and rotated by the roll with the small outer diameter, thereby obtaining a light-weight and compact transfer unit.