Fixing device and image forming apparatus

A fixing device comprising:

• a rotatable endless belt;
• a planar heat-generating section in which at least a downstream end portion in a movement direction of the belt is in pressure contact with a rotating body via a pressure contact portion and a cross-sectional shape of a downstream edge portion being in contact with an inner surface of the belt is formed in a curved shape having a curvature radius of 0.01 mm or more and 0.2 mm or less or in a shape in which the downstream edge portion has a cut out;
• and
• a holding section that is disposed inside the belt and holds the planar heat-generating section to be in pressure contact with the rotating body,
• wherein the downstream end portion of the planar heat-generating section in the movement direction of the belt is located inside the pressure contact portion, and an upstream end portion of the planar heat-generating section in the movement direction of the belt is located outside the pressure contact portion.