A platelike sensor element (10), in particular for determining the oxygen content of exhaust fumes of internal combustion engines, has at least one measurement cell (12) with an oxygen ion conducting solid electrolyte and a heating element (14). The measurement cell (12) and the heating element (14) are joined together by an electrically insulating layer (50) made of at least one crystalline, non-metallic material and of at least one vitreous material. A glazing filled with the crystalline, non-metallic material is formed when the sensor element (10) is sintered.
