A belt extends a plurality of rollers, and bears thereon an image formed by an
image forming device or a transfer material onto which the image is transferred.
The belt satisfies the following relationship: 1.5break/max10,
wherein max represents the strain at the time of applying to
the belt a maximum stress value obtained from a stress-strain curve measured in
accordance with JIS K7161, and break represents the strain at
a breaking point of the belt.
