Abstract: A cooking device with a microwave heater and a gas heater as well as a cooling fan for the microwave heater. A first circuit operates the microwave heater and is connected to a source of electric power through a first switching circuit. A second circuit operates the gas heater and is connected to the electric source of power through a second switching circuit, as well as a switch arranged to be operated with a gas cock. A driving circuit for the cooling fan is connected to that switch so as to be parallel with a circuit connecting in series the second circuit and the second switching circuit. The switch, furthermore, has a first contact connected to the electric source of power through the first switching circuit and has a second contact connected to the source of power without passing through the first switching circuit, while being arranged to be connected to the first contact when the gas cock is closed and to the second contact when the gas cock is opened.