HEAT ROLLER AND ROLLER HEATING DEVICE

PROBLEM TO BE SOLVED: To provide a heat roller and roller heating device which prevents short in an electric wire forming a coil and is excellent in safety. SOLUTION: The heat roller 11 of an induction heat system which has a hollow roller 34, composed of a conductive member, and a coil 42 disposed in the roller 34 is provided with a bobbin 41 which is made of an insulation material, forms recesses and projections on its surface, and is disposed inside the coil 42. The coil 42 is wound upon the bobbin 41 along recesses 46, formed by the recesses and projections, in such a way as to make gaps between the loops of the electric wire of the coil 42.