Abstract: Gas cooking appliance comprising a gas burner equipped with a gas injector 1 fixed to a support 3 and a gas supply tube 2; the support is a sheet metal plate 3 with a through-aperture 4; the injector 1 is fixed to the end of the tube 2; the injector 1 and/or the tube 2 extend through the aperture 4 with the injector 1 and tube 2 one on each side of the plate 3; and a radial annular flange (6) is provided on the tube 2 and situated under the plate 3, being clamped in a sealed fashion against the peripheral edge of the aperture 4 and/or bearing surface 12 of the injector 1 so as to seal between the tube 2 and the injector 1 and between the top and the underside of the plate 3 around the edge of the aperture 4, and to hold the injector 1 secured to the tube 2 centrally in the aperture 4 in a predetermined axial position above the plate 3.