The present invention relates to a microwave oven with a feed box system. The feed box system includes a primary feed box (10) and a secondary feed box (12). The primary feed box (10) and the secondary feed box (12) are arranged one upon the other at a cavity wall (14) of an oven cavity (16). The circumference of the primary feed box (10) is smaller than the circumference of the secondary feed box (12). The secondary feed box (12) and at least that cavity wall (14), at which the feed box system is arranged, form a single-piece part. The primary feed box (10) is fixed to the secondary feed box (12) and covers a recess of said secondary feed box (12). A microwave source (18) is arranged at the primary feed box (10). An antenna (20) of the microwave source (18) extends into the interior of the primary feed box (10). The axis of the antenna (20) extends along another direction as a normal vector of the cavity wall (14), at which the feed box system is arranged.
