A cooking device, comprising: a heating chamber configured to accommodate an object-to-be-heated; a microwave heater including a microwave generator and a microwave supply unit, the microwave generator and the microwave supply unit being configured to apply microwave heating to the object-to-be-heated accommodated in the heating chamber, a circulation fan configured to suck air in the heating chamber and blow the air into the heating chamber; a hot air circulation heater including a convection heater configured to heat the air sucked from the heating chamber; a heating chamber internal flow path forming unit disposed inside the heating chamber and configured to define a flow rate and a blowing direction of the air blown into the heating chamber by the circulation fan; and an internal temperature sensor disposed in a circulation path of the air, the circulation path being formed inside the heating chamber by the heating chamber internal flow path forming unit, wherein the circulation fan is configured to suck the air from the heating chamber through a plurality of openings in a central region of the wall forming the heating chamber, and blows the air near the top face of the heating chamber from a plurality of openings disposed in a near-top-face region of the wall, the heating chamber internal flow path forming unit and the internal temperature sensor are provided on a top face side of the wall, characterized in that the heating chamber internal flow path forming unit includes a wind duct and a wind guide, wherein the wind duct is configured to increase the flow rate of the air blow near the top face of the heating chamber, and the wind guide is configured to guide the blowing direction of the air blown near the top face of the heating chamber to at least the lower side of the heating chamber, the wind guide is a dielectric, the internal temperature sensor is disposed in a section of the circulation path from an outlet port of the wind duct to the wind guide. a heating chamber configured to accommodate an object-to-be-heated; a microwave heater including a microwave generator and a microwave supply unit, the microwave generator and the microwave supply unit being configured to apply microwave heating to the object-to-be-heated accommodated in the heating chamber, a circulation fan configured to suck air in the heating chamber and blow the air into the heating chamber; a hot air circulation heater including a convection heater configured to heat the air sucked from the heating chamber; a heating chamber internal flow path forming unit disposed inside the heating chamber and configured to define a flow rate and a blowing direction of the air blown into the heating chamber by the circulation fan; and an internal temperature sensor disposed in a circulation path of the air, the circulation path being formed inside the heating chamber by the heating chamber internal flow path forming unit, wherein the circulation fan is configured to suck the air from the heating chamber through a plurality of openings in a central region of the wall forming the heating chamber, and blows the air near the top face of the heating chamber from a plurality of openings disposed in a near-top-face region of the wall, the heating chamber internal flow path forming unit and the internal temperature sensor are provided on a top face side of the wall, characterized in that the heating chamber internal flow path forming unit includes a wind duct and a wind guide, wherein the wind duct is configured to increase the flow rate of the air blow near the top face of the heating chamber, and the wind guide is configured to guide the blowing direction of the air blown near the top face of the heating chamber to at least the lower side of the heating chamber, the wind guide is a dielectric, the internal temperature sensor is disposed in a section of the circulation path from an outlet port of the wind duct to the wind guide.