To provide a high-frequency heating cooker with an oven hood, capable of performing automatic ventilation of product gas generated from another heating cooker installed below the cooker body, and automatic stopping of the cooker body in the case of ignition of product gas and fire of cooked material.

Combustion gas generated during the use of another heating cooker installed below the cooker body 1 and product gas such as oil component, smoke and vapor from the cooked material 15 are detected by a first detector 17 to operate a ventilating fan 10, thereby sucking the product gas from intake ports 9a, 9b into the cooker body 1 to be passed through the ventilating fan 10, and discharging the same to the outdoor from an exhaust port 11 through an exhaust duct. Subsequently, when the cooked material 15 or product gas is ignited during the use of another heating cooker installed below the cooker body 1 to generate flame or high-temperature smoke, the generation is detected by a second detector 18 to intercept the power supply to the high-frequency generator 6, the control means 19 and an electric circuit 20.