To provide an electromagnetic cooker capable of determining whether there is a pan or not while controlling an output power at a constant level, even when the output power is low.

In the electromagnetic cooker composed of a current transformer 4 to detect a power supply electric current Is, conversion resistances 6, 7 to convert an output electric current It of the current transformer 4 to a voltage signal Vs, and a control device 9 to carry out an electric power control based on the voltage signal Vs and the determination whether or not there is the pan, when the power supply electric current Is is large, a resistance value of the conversion resistances 6, 7 is reduced, and when the power supply electric current Is is small, the resistance value of the conversion resistance 6 is increased.