Fixing device

A fixing device comprising:

• an endless belt configured to apply heat to a recording material;
• a rotatable pressing member contacting an outer circumferential surface of the belt;
• and
• a sliding member inside of the belt, configured to form a nip portion by nipping and feeding the belt between itself and the rotatable pressing member and to slide on an inner circumferential surface of the belt,
• wherein the rotatable pressing member nips and feeds the recording material in the nip portion in cooperation with the belt and fixes a toner image on the recording material by applying heat and pressure,
• wherein the sliding member includes a substrate extending in a widthwise direction of the belt, and
• wherein the substrate is made of metal and includes a plurality of projections projecting toward the rotatable pressing member.