A vacuum pump, in particular a turbomolecular vacuum pump, comprising - at least one pump stage (11, 13) which comprises a stator (11a, 13a) and a rotor rotating relative to the stator (11a, 13a) about an axis of rotation during operation, and - at least one magnetic bearing for an end region of the rotor near the inlet, said magnetic bearing comprising a magnetic bearing rotor and a magnetic bearing stator interacting therewith, said magnetic bearing rotor and magnetic bearing stator each having a stack of a plurality of permanent magnet rings (19a, 21a), wherein the magnetic bearing rotor is attached to the rotor and the magnetic bearing stator is attached to a holder of the stator (11a, 13a), wherein a separate magnet carrier is provided for the magnetic bearing stator, at which magnet carrier the permanent magnet rings can be completely mounted independently of the holder and which magnet carrier can be attached together with the completely mounted permanent magnet rings as a unit to the holder, and wherein the axial position of the magnet carrier at the holder is adjustable with respect to the axis of rotation, wherein the holder has a passage which extends parallel to the axis of rotation and through which the magnet carrier is accessible, starting from the inlet side of the pump, for a manually or automatically operable setting tool for setting the axial position of the magnet carrier, characterized in that the one of two mutually associated bearing parts (51, 53) of a catch bearing or emergency bearing for the rotor having the other bearing part is arranged at a free end region of the magnet carrier remote from the inlet. - at least one pump stage (11, 13) which comprises a stator (11a, 13a) and a rotor rotating relative to the stator (11a, 13a) about an axis of rotation during operation, and - at least one magnetic bearing for an end region of the rotor near the inlet, said magnetic bearing comprising a magnetic bearing rotor and a magnetic bearing stator interacting therewith, said magnetic bearing rotor and magnetic bearing stator each having a stack of a plurality of permanent magnet rings (19a, 21a), wherein the magnetic bearing rotor is attached to the rotor and the magnetic bearing stator is attached to a holder of the stator (11a, 13a), wherein a separate magnet carrier is provided for the magnetic bearing stator, at which magnet carrier the permanent magnet rings can be completely mounted independently of the holder and which magnet carrier can be attached together with the completely mounted permanent magnet rings as a unit to the holder, and wherein the axial position of the magnet carrier at the holder is adjustable with respect to the axis of rotation, wherein the holder has a passage which extends parallel to the axis of rotation and through which the magnet carrier is accessible, starting from the inlet side of the pump, for a manually or automatically operable setting tool for setting the axial position of the magnet carrier, characterized in that the one of two mutually associated bearing parts (51, 53) of a catch bearing or emergency bearing for the rotor having the other bearing part is arranged at a free end region of the magnet carrier remote from the inlet.