An endless belt including a belt main body in which a ten-point average roughness (Rz) of an inner peripheral surface thereof is in a range of 2.0 .mu.m or higher and 10.0 .mu.m or lower and an average distance (Sm) between projections and depressions of the inner peripheral surface is in a range of 50 .mu.m or higher and 200 .mu.m or lower, and a guide portion in which an average distance (Sm') between projections and depressions on an adhesive surface thereof adhered to the inner peripheral surface of the belt main body along an edge of the belt main body is two times or higher and six times or lower the average distance (Sm) between projections and depressions in the inner peripheral surface.