To maintain high temperature detection precision regardless of accidental or chronic factors.

A heat generation layer 8 is made to generate heat by an induction coil 14 and a pot 4 is heated. Also, a heat receiving plate 21 is disposed on a position opposite to the pot 4 near the heat generation layer 8. By a pot temperature sensor 22, a lot of radiation heat quantity from the pot 4 is detected. Also, a radiation heat quantity difference to the heat receiving plate 21 is large at the time of stopping heating and the responsiveness of the pot temperature sensor 22 is improved. Since a temperature is detected by radiation heat from the pot 4, the temperature detection precision is not controlled by the contact state of the heat receiving plate 21 and the pot 4.