A fixing device is provided with a fixing member for thermally fixing a transferred toner image to a transfer material, and a pressing member held in contact with the fixing member to form a nip portion where the transfer material is caused to pass through, wherein the fixing member includes a nonmagnetic metal layer made of nonmagnetic metal, a temperature-sensitive metal layer made of temperature-sensitive metal, and an induction coil for induction heating by supplying magnetism toward the nonmagnetic metal layer and the temperature-sensitive metal layer. The thickness of the nonmagnetic metal layer is set such that an amount of heat produced by the fixing member is larger than an amount of heat evolved singly by the temperature-sensitive metal layer.