Abstract: A bumper sensor able to obtain a grasp of a change of shape of a bumper in two dimensions or three dimensions, able to sense a size etc. of a contacting object, and able to be made simple in system configuration is provided. A plurality of optical fibers (20a, 20b) having sensor portions are provided in a surface layer portion or on the front surface of a bumper body 10 for an automobile vehicle, each optical fiber is consisted of a core and a cladding provided on an outer circumference of the core, sensor portions enabling interaction of a portion of transmitted light with the external environment are two-dimensionally arranged at a plurality of positions on a surface forming the front surface of the bumper body, and provision is further made of a light source 11 for emitting incident light to incident ends of optical fibers, and a light receiving portion 13 for detecting beams emitted from emitting ends of optical fibers via sensor portions.