The invention relates to a Faraday rotator for a Faraday isolator (10), comprising an entrance polarizer, an exit polarizer, and an interposed cylindrical optical crystal (13) that is arranged symmetrically to the axis of symmetry (x). The rotator further comprises an upright hollow cylinder (11) produced from an axially magnetized permanent-magnetic material, which encloses the crystal. The magnetic field of said material extends in a hollow space (12) parallel to the axis of symmetry that extends in only one direction from the north pole to the south pole. One terminal magnet (16, 17) each follows the two front faces (14) in the plane defined by the y and z direction which is perpendicular to the axis of symmetry. Said terminal magnet is configured as a hollow, upright cylinder and has a through-opening (18) in the prolongation of the axis of symmetry. The Faraday rotator according to the invention is characterized in that every terminal magnet is, at least in some sections, magnetized in a substantially radial manner with respect to the axis of symmetry. One of the two terminal magnets is radially magnetized from the inside to the outside and the other terminal magnet is radially magnetized from the outside to the inside. The hollow cylinder, with its north pole, adjoins the terminal magnet which is magnetized from the inside to the outside, and with its south pole it adjoins the terminal magnet which is magnetized from the outside to the inside.