To provide a temperature sensor for reducing a size, a weight and a power consumption.

The temperature sensor 210T is provided with a plurality of pairs of bimetal cantilever sensors 211 whose levers 212 have gradually-different length. If a temperature rises and reaches the predetermined temperatures determined by the lengths of the levers 212 in each pair, the lever 212 contacts an electrical contact member 214, and an output signal from a detection circuit 215b is turned on in a signal processing circuit 215. If the temperature continuously rises in a sensor control section, the signal processing circuit 215 in each pair sequentially outputs the output signal turned on in order of the lengths of the levers 212.