Abstract: A detecting apparatus for detecting a living body information includes a sensor body provided to contact a surface of a living body, and a band fixing bar elongated in a longitudinal direction, through which a band is engaged and is detachably connectable to the sensor body. In the detecting apparatus, the sensor body has a pair of holding portions for holding end portions of the band fixing bar in the longitudinal direction. The holding portion has an inlet concave portion from which the end portion of the band fixing bar is inserted, and a recess portion for receiving the end portion of the band fixing bar. Furthermore, the recess portion communicates with the inlet concave portion and recesses toward the living body, and the end portion of the band fixing bar is fitted into the recess portion. Therefore, the band fixing bar does not easily come off from the sensor body.