An image forming apparatus includes an intermediate transfer belt having a
coated layer as a surface layer that carries an developer image on the
surface layer, a light-emitting member that emits light rays having a
predetermined wavelength toward the surface layer of the intermediate
transfer belt, and a sensing member that senses the light rays reflected
from the intermediate transfer belt. The intermediate transfer belt
includes a metal layer whose light reflection coefficient is larger than
that of the coated layer and an intermediate layer positioned between the
coated layer and the metal layer, and the intermediate layer that
restrains the different light rays having a wavelength other than the
predetermined wavelength from reflecting from the intermediate transfer
belt.