PROBLEM TO BE SOLVED: To measure the temperature at a part to be measured remotely by covering the periphery of a permanent magnet with temperature-sensitive magnetic bodies and detecting leakage flux depending on the temperature.
SOLUTION: The temperature measuring element comprises a permanent magnet 2, and temperature-sensitive magnetic bodies 3, 4 covering the periphery thereof. The permanent magnet 2 is formed of a strong SmCo based or SmFe based permanent magnet material. The temperature-sensitive magnetic bodies 3, 4 are formed of a magnetic material, e.g. NiZn ferrite, such that a relation of T1>T2 is satisfied between the Curie point T1 of the temperature-sensitive magnetic body 3 on the inside and the Curie point T2 of the temperature- sensitive magnetic body 4 on the outside. When the temperature measuring element 1 is positioned at a part to be measured, leakage flux therefrom is increased as the temperature increases and maximized when T (temperature at the part to be measured) ≤T1. When the leakage flux is measured by a magnetic sensor spaced apart by a specified distance from the temperature measuring element 1, temperature at the part to be measured can be measured remotely in real time up to T1 based on the output from the magnetic sensor.