Abstract: The invention relates to an exhaust-gas turbocharger (1) for an internal combustion engine, said turbocharger comprising a device (26) for detecting the speed of the turbocharger shaft (5). The device (26) for detecting the speed comprises an element (21) for varying a magnetic field, which is located on and/or in the end (10) of the turbocharger shaft (5) that is on the compressor side, said variation of the magnetic field (25) taking place in accordance with the rotation of the turbocharger shaft (5). A sensor element (19) is provided in the vicinity of the element (21) for varying the magnetic field (25), said sensor element detecting the variation in the magnetic field and converting it into electric signals that can be evaluated.