The invention relates to a temperature detecting apparatus and an automobile using the same, and is intended to improve the heat response characteristic.The apparatus comprises a first metal pipe, first and second metal wires accommodated in the first metal pipe, at least one end of each wire being projected from one end of the first metal pipe, an insulator for keeping an electric insulation of the first metal pipe and the first and second metal wires in the first metal pipe, a temperature detecting element projecting out of one end of the first metal pipe and disposed between ends of the first and second metal wires, and a metal cap fitted to one end of the first metal pipe for covering the temperature detecting element, wherein the temperature detecting element is in a substantially flat shape or in a flat shape longer in the length in the direction between the first and second metal wires than the length in the direction at right angle thereto, and a portion of the metal cap opposite to the temperature detecting element is in a flat shape in the same direction in a shape similar to the temperature detecting element.