A fixing device of the present invention has first and second thermistors which
detect the temperatures at predetermined positions in the longitudinally direction
of a heating roller, first and second coils which can increase independently the
temperatures at the center and the end of the heating roller, a driving circuit
which supply power alternately to the coils, first and second switching circuits
which supply a predetermined power to each coil, a control unit, and a temperature
detection circuit.
