<p>In a collision detecting apparatus (2), an optical fiber (211) of an optical fiber sensor (23) extends in a right and left direction of a vehicle between a bumper (1) and a bumper reinforcement member (7). A collision sensitivity compensating member (212) is disposed in a load transmission path through which a collision load is transmitted from the bumper (1) to the bumper reinforcement member (7) via the optical fiber (212) at a time of a collision. The collision sensitivity compensating member (212) has at least one of a shape and a mechanical property that reduces unevenness of a transmission characteristic of the collision load to the optical fiber (211) in the load transmission path with respect to the right and left direction of the vehicle.</p>
