Patent ID: 8183876

Claim:
A water content detection sensor comprising: a circuit member in which low resistance conductors disposed in parallel to each other and a high resistance conductor connecting end portions of the respective low resistance conductors; a carrier body having a water-proof property and an insulating property; and a coating body having a water-proof property and an insulating property, the circuit member being disposed between the carrier body and the coating body, wherein a plurality of exposure holes are formed to the carrier body or the coating body so as to expose the low resistance conductors at plural portions, and when water content adheres between the exposure holes and the low resistance conductors are then short-circuited in a current conduction state, a current value is made larger than that before the water content adheres and discrete portions of the low resistance conductors corresponding to and aligned with the exposure holes are formed as enlarged portions each having an area larger than that of the exposure holes.