PURPOSE: To prevent disconnection of windings even if a sensor is used in severe environment by constituting a conductive part of the coil windings of an outside conductive layer and a reinforcing material layer which is formed in the outside conductive layer and has high mechanical strength.

CONSTITUTION: The coil windings 20 of the electromagnetic power generation type rotation sensor is constituted of the conductive part 21 and an insulating layer 22 provided on the outside of the conductive part 21. The upper conductive part 21 is constituted of the outside layer 21a consisting of a good electrical conductor and the inside layer 21b which is provided in the layer 21a and has the high mechanical strength. The disconnection of the windings is thus prevented by using the windings having the high mechanical strength in such a manner even if the electromagnetic power generation type rotation sensor is used in the severe environment.