Around a heat roller, a center thermistor (20c) as a first temperature sensor is placed within the range of ±45° from a portion where maximum heat is generated by an IH coil, and a front thermistor (20f) as a second temperature sensor is placed within the range of ±45° from a portion where minimum heat is generated by the IH coil. A main CPU (201) performs fixing control on the basis of sensing temperatures from these two thermistors (20c, 20f). This can prevent an increase in the cost and uniformize the heat distribution of a fixing roller.