An induction heating method for an induction heating unit that includes a plurality of heating coils (322a-322d), resonance-type inverters (314a-314d) respectively corresponding to the plurality of heating coils (322a-322d), and forward converting sections or chopper sections (316a-316d) and forward converting sections, which are connected to the resonance-type inverters (314a-314d), wherein frequencies of respective currents supplied to the heating coils (322a-322d) which are in mutual induction are equalized to each other, the method comprises: inductively heating an object to be heated; outputting a drive signal to one of the resonance-type inverters (314a-314d) corresponding to one of the heating coils (322a-322d); and adjusting the phase of the current supplied to the one of the heating coils (322a-322d) based on the drive signal; characterized by detecting a phase difference between the current supplied to the one of the heating coils (322a-322d) and a current supplied to another one of the heating coils; and controlling the drive signal to be given to the one of the resonance-type inverters (314a-314d) based on the detected phase difference; while the one of the resonance-type inverters (314a-314d) adjusts the phase of the current supplied to the one of the heating coils (322a-322d) so as to make the phase difference between the current supplied to the one of the heating coils and the current supplied to the other of the heating coils zero or at a phase difference to be set, the forward converting sections in the induction heating unit in which the forward inverting sections are connected, or the chopper sections (316a-316d) in the induction heating unit in which the chopper sections and the forward converting sections are connected, control power supplied to the heating coils (322a-322d), thereby controlling temperature distribution of the object to be heated. inductively heating an object to be heated; outputting a drive signal to one of the resonance-type inverters (314a-314d) corresponding to one of the heating coils (322a-322d); and adjusting the phase of the current supplied to the one of the heating coils (322a-322d) based on the drive signal; characterized by detecting a phase difference between the current supplied to the one of the heating coils (322a-322d) and a current supplied to another one of the heating coils; and controlling the drive signal to be given to the one of the resonance-type inverters (314a-314d) based on the detected phase difference; while the one of the resonance-type inverters (314a-314d) adjusts the phase of the current supplied to the one of the heating coils (322a-322d) so as to make the phase difference between the current supplied to the one of the heating coils and the current supplied to the other of the heating coils zero or at a phase difference to be set, the forward converting sections in the induction heating unit in which the forward inverting sections are connected, or the chopper sections (316a-316d) in the induction heating unit in which the chopper sections and the forward converting sections are connected, control power supplied to the heating coils (322a-322d), thereby controlling temperature distribution of the object to be heated.