Glow plug and method for manufacturing the same

Glow plug with a heating rod, in which an inner pole associated with heating and, if necessary, control elements, leads, and an external pole, said external pole, the wall of the electrically isolated from adjacent parts of the plug body heating rod (2), wherein the electrical insulation (5 ) comprising an insulating material (6) which is introduced between an inner (7) and an outer (8) support tube, and wherein the inner support tube (7) surrounding the heating rod (2) adjacent, and the plug body (1), the outer support tube (8) surrounds fitting.