HEAT SENSOR AND HEAT/SMOKE COMBINATION-TYPE FIRE DETECTOR

The problem to be overcome by the present disclosure is to provide a heat sensor which may reduce the chances of excessively lowering the heat of a gas flowing toward a heat detection unit. A heat sensor 1 includes a base 1b and a heat sensor body 1a. The base 1b is to be mounted onto a mounting surface X11 of a building. The heat sensor body 1a has a bottomed cylindrical shape and is to be attached to the base 1b. The heat sensor body 1a includes an opening 7, a board 2, a heat detection unit 3, and at least one wall member 522. The at least one wall member 522 controls flow of a gas to cause the gas that passed through the opening 7 to flow toward the heat detection unit 3. The at least one wall member 522 separates the flow of the gas that has entered the heat sensor body 1a from an external space SP2 through the opening 7 into a plurality of gas flows and directs one of the plurality of gas flows, which has been separated to flow beside an inner surface of the heat sensor body 1a, toward the heat detection unit 3.