Wheel speed sensor

A wheel speed sensor that is to be arranged opposing a ring-shaped rotor that rotates in synchronization with rotation of a wheel and exhibits magnetic poles that are mutually different and alternate in a circumferential direction, the wheel speed sensor comprising:

• a plurality of magnetic field detectors configured to output detection signals that correspond to magnetic field fluctuation caused by rotation of the rotor;
• and
• an attachment member that includes an attachment portion that is to be attached to a vehicle and a holding portion that is configured to hold the plurality of magnetic field detectors, and that, in a state in which the attachment portion is attached to the vehicle, when viewed along a center axial direction of the rotor, holds the plurality of magnetic field detectors such that centers of element surfaces of the magnetic field detectors that oppose the rotor are arranged at a position that is closer to a center line, which passes centrally between an outer peripheral line that depicts the outer periphery of the rotor and an inner peripheral line that depicts the inner periphery of the rotor, than to the outer peripheral line and the inner peripheral line.