To provide a load sensor which avoids the change of a resistance value of a distortion resistance element at the time of calcination, as well as maintains moisture-proof effect sufficiently.

The load sensor is equipped with: an origin distortion body 1 formed from the metal base substrate; an insulated glass layer 6 provided in the upper surface of this origin distortion body 1; a circuit pattern 9 provided in the upper surface of this insulated glass layer 6; distortion resistance elements 2, 3, 4, 5 electrically connected to this circuit pattern 9; and a coating layer 10 for covering the upper surface of these distortion resistance elements 2, 3, 4, 5, while this coating layer 10 is formed by the moisture-proof coating material consisting of fluororesin.