Speed sensor for measuring a speed of a rotating object moving relative to the speed sensor , having a speed sensor housing which is designed to be set in a slide-fitting and/or friction-fitting and/or form-fitting manner into a stationary receptacle, wherein a) the speed sensor is a rotational speed sensor, and wherein b) the speed sensor comprises a Hall element and a semiconductor chip for sampling changes in a magnetic field, and wherein c) on an end face of the peripheral surface of an injection moulded article facing towards the rotating object is formed an end-face outer recess , and wherein d) the injection moulded article has on its outer peripheral surface facing towards an inner surface of a wall of the speed sensor housing at least one outer recess , wherein between a delimiting surface of an outer recess and the inner surface of the wall of the speed sensor housing is formed respectively one empty outer chamber, and wherein e) the speed sensor housing is cup-shaped and has a speed sensor housing base on its end facing towards the rotating object, and wherein f) between the base surface of the end-face outer recess and the speed sensor housing base is formed an end-face empty outer chamber, and wherein g) at least one empty outer chamber is evacuated, filled with air under environmental pressure or partially evacuated, characterized in that h) the speed sensor housing encloses the injection moulded article made of plastic, into which the speed sensor element is injected, and that i) in the base surface of the end-face outer recess is arranged the speed sensor element, and that j) a coupling element made of ferromagnetic material is present which extends axially from the speed sensor element into the end-face outer recess of the injection moulded article . a) the speed sensor is a rotational speed sensor, and wherein b) the speed sensor comprises a Hall element and a semiconductor chip for sampling changes in a magnetic field, and wherein c) on an end face of the peripheral surface of an injection moulded article facing towards the rotating object is formed an end-face outer recess , and wherein d) the injection moulded article has on its outer peripheral surface facing towards an inner surface of a wall of the speed sensor housing at least one outer recess , wherein between a delimiting surface of an outer recess and the inner surface of the wall of the speed sensor housing is formed respectively one empty outer chamber, and wherein e) the speed sensor housing is cup-shaped and has a speed sensor housing base on its end facing towards the rotating object, and wherein f) between the base surface of the end-face outer recess and the speed sensor housing base is formed an end-face empty outer chamber, and wherein g) at least one empty outer chamber is evacuated, filled with air under environmental pressure or partially evacuated, characterized in that h) the speed sensor housing encloses the injection moulded article made of plastic, into which the speed sensor element is injected, and that i) in the base surface of the end-face outer recess is arranged the speed sensor element, and that j) a coupling element made of ferromagnetic material is present which extends axially from the speed sensor element into the end-face outer recess of the injection moulded article . <EOS>