There is provided a temperature detector adapted to be provided in a temperature sensor for detecting a temperature of a temperature detection target. The temperature detector includes a cylindrical fixing body made of a metal material, the cylindrical fixing body having a single through hole extending therethrough and one axial end portion serving as a fixing portion, a thermocouple having a pair of wires partially inserted into the through hole and a welding material welded to the fixing portion while being at least partially inserted into the through hole to fix the thermocouple to the fixing portion. An end of the thermocouple is exposed on a surface of the welding material by polishing the welding material together with the thermocouple.
