Provided is a fixing belt wherein the surface roughness of the inner peripheral surface of the fixing belt is designed with consideration given not only to the height of the protruding section and the depth of the recessed section but also to the expansion of the protruding section and recessed section in the lateral direction so that the contact resistance, hence, the sliding resistance can be reduced, and stable holding of the lubricant can be ensured. A fixing belt used in an image forming apparatus to fix a toner image on a recording material; wherein a wavy pattern which has a height of 3 to 5 .mu.m at a pitch of 4 to 5 mm is formed on an inner peripheral surface, and a roughened structure which has a height of 3 to 4 .mu.m at a pitch 0.1 mm is formed.