Disclosed is a dielectric heat cooking device having a configuration to block visible light from entering an infrared sensor, wherein an abnormality of the infrared sensor can be accurately detected before heating. The dielectric heat cooking device is comprised of a sensor failure detecting light emitting portion (7) which irradiates visible light to detect the failure of an infrared sensor (5); a visible light blocking filter (6) provided on the surface of a printed circuit board (5) holding the infrared sensor (5) so as to cover the field of view of an infrared sensor (4); and a control portion (11) which controls the output of an inverter circuit (10) for supplying high-frequency current to a heating coil (3) when the output of the infrared sensor (5) is not more than a threshold value while the sensor failure detecting light emitting portion (7) is turned on. The infrared sensor (5) is configured to receive visible light emitted from the sensor failure detecting light emitting portion (7) to the inside of the visible light blocking filter (6).
