A holder structure for a sensor and a sensor for detecting a change in the magnetic field including the same are provided. The holder structure for a sensor according to an exemplary embodiment of the present disclosure may include a body which is elongated; a sensor unit seating part formed at one end of the body in the longitudinal direction; a cable seating part formed at the other end of the body in the longitudinal direction; a first fixing part having a first protrusion formed to protrude from one side of the body, and a first groove concavely formed on a front-end surface of the first protrusion; and a second fixing part having a second protrusion formed to protrude from the other side of the body, and a second groove concavely formed on a front-end surface of the second protrusion.