A heating device heats, by electromagnetic induction heating, a heating member disposed in a fixing device for use in an image forming apparatus. The fixing device heats and fixes an image on a recording material while nipping and transporting the recording material. The heating device includes an exciting coil that is disposed along the heating member and generates an alternating magnetic flux to heat the heating member by electromagnetic induction heating, a demagnetizing coil that encircles part of the alternating magnetic flux generated by the exciting coil and generates an electro motive force in a direction that cancels the alternating magnetic flux, and a demagnetizing regulator that is provided in a demagnetizing circuit including the demagnetizing coil and adjusts a current to be generated in the demagnetizing coil.