To provide a watertight durable temperature sensor with high temperature sensitivity, good temperature linearity, and few variations in characteristics of which the internal substrate and elements are not affected by external forces.

Characteristics-selected transmitters 13 and 14 are selectively and serially connected, and a resistance 15 is combined in parallel with them and arranged on the substrate 16. A plurality of protrusions 21-23 are formed in the longitudinal direction of the substrate 16. After the substrate 16 is inserted in a case 18 and fixed by a fastener 19, a filler 20 with good thermal conductivity and elasticity is filled and solidified to secure the watertightness of the substrate 16 and the case 18.