A weft guiding comb of a jet loom wherein the weft is inserted across the shed by a stream of fluid carrying medium. The comb contains relay bodies located under the lower warp threads of the shed at the reed. The reed consists of flat dents to beat up the inserted weft to the fabric, the wall of which adjacent to said lower warp threads of the shed is one part of the weft guiding comb wall. Such wall is provided with saw-toothed projections, the face surfaces of which at least in the moment of the weft insertion carry the lower warp threads of the shed, and in the faces of which, transverse to the direction of the weft insertion, there are the mouths of the relay nozzles pointing in the direction of the weft insertion. The other part of the weft guiding comb wall are the backs of the reed dents, said dents being above the wall of the relay body with saw-toothed projections provided with nose extensions, the length of which corresponds with the width of the back surface of the relay body saw-toothed projections.