An induction heating apparatus capable of stably operating at least one switching element contained therein is provided with a control circuit 5 which comprises a resonance waveform detector 6 for detecting a high frequency AC waveform supplied from an inverter circuit 3 to a heating coil 4 to produce a detection signal DS.sub.1 corresponding to high frequency AC power waveform; a phase comparator 8 for producing an adjusting signal PH corresponding to a phase difference between detection signal DS.sub.1 from resonance waveform detector 6 and drive signal D.sub.1 from drive circuit 7; and an addition circuit 13 for superimposing the drive signal D.sub.1 from drive circuit 7 on detection signal DS.sub.1 from resonance waveform detector 6 to supply to phase comparator 8the superimposed signal on a level same as or over operation threshold value V.sub.TH for the phase comparator 8.