Wheel speed sensor and the wire harness

A wheel speed sensor which is capable of preventing penetration of moisture into the interior, and the wheel speed sensor to provide a connected wire harness. Wheel speed sensor 1, a waterproof member 40 attached to the electric wire 7a is connected to the Hall IC 20, and a covering member 50 which covers the waterproof member 40, a configuration embedded in the exterior unit 10. The covering member 50 is molded in an easy material fused to the exterior portion 10. The grooves 41 formed on the outer peripheral surface of the waterproof member 40, to form protrusions 52 on the inner peripheral surface of the covering member, preventing the axial movement of the waterproof member 40 by the engagement of the groove 41 and protrusions 52 to. Incidentally wheel speed sensor does not include a covering member 50 may be configured to use a waterproof member formed in an easy material fused to the exterior portion 10.