A cooking device, comprising: a heating chamber configured to accommodate an object-to-be-heated; 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 heat source configured to apply hot air circulation heating to the object-to-be-heated accommodated in 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; an internal temperature sensor disposed in a circulation path of the air and provided in a region apart from the heating chamber internal flow path forming unit by a predetermined distance, the circulation path being formed inside the heating chamber by the heating chamber internal flow path forming unit; and 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, the cooking device further comprises a plurality of openings in a wall constituting the heating chamber, the openings including a group of first openings and a group of second openings, wherein the group of the first openings is disposed in a central region of the wall and configured to suck the air in the heating chamber by operation of the circulation fan, wherein the group of the second openings is disposed in a near-top-face region of the wall and configured to blow the air near a top face of the heating chamber by operation of the circulation fan, wherein the heating chamber internal flow path forming unit and the internal temperature sensor are provided near the top face of the heating chamber, characterized in that, the heating chamber internal flow path forming unit includes at least one wind guide configured to guide the air blown near the top face of the heating chamber to at least a lower part of the heating chamber, wherein the at least one wind guide is a dielectric, the at least one wind guide includes a first wind guide that, in the circulation path, the air blown from the wind duct reaches first, among the at least one wind guide, wherein the internal temperature sensor is disposed apart from a position of the at least one wind guide by a predetermined distance, and wherein the internal temperature sensor is configured to operate as a detector that detects "empty heating" in microwave heating. a heating chamber configured to accommodate an object-to-be-heated; 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 heat source configured to apply hot air circulation heating to the object-to-be-heated accommodated in 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; an internal temperature sensor disposed in a circulation path of the air and provided in a region apart from the heating chamber internal flow path forming unit by a predetermined distance, the circulation path being formed inside the heating chamber by the heating chamber internal flow path forming unit; and 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, the cooking device further comprises a plurality of openings in a wall constituting the heating chamber, the openings including a group of first openings and a group of second openings, wherein the group of the first openings is disposed in a central region of the wall and configured to suck the air in the heating chamber by operation of the circulation fan, wherein the group of the second openings is disposed in a near-top-face region of the wall and configured to blow the air near a top face of the heating chamber by operation of the circulation fan, disposed in a near-top-face region of the wall and configured to blow the air near a top face of the heating chamber by operation of the circulation fan, wherein the heating chamber internal flow path forming unit and the internal temperature sensor are provided near the top face of the heating chamber, characterized in that, the heating chamber internal flow path forming unit includes at least one wind guide configured to guide the air blown near the top face of the heating chamber to at least a lower part of the heating chamber, wherein the at least one wind guide is a dielectric, the at least one wind guide includes a first wind guide that, in the circulation path, the air blown from the wind duct reaches first, among the at least one wind guide, wherein the internal temperature sensor is disposed apart from a position of the at least one wind guide by a predetermined distance, and wherein the internal temperature sensor is configured to operate as a detector that detects "empty heating" in microwave heating.