A ceramic glow plug
A ceramic glow plug comprises a ceramic heater (2) with a heating element (22) a positive electrode (23) and a negative electrode (24) a housing (32) which is attached to a plug attachment hole of an engine head (11) a sleeve (31) which is electrically connected to the negative electrode, and a cap (5) which is adapted to the side surface of the ceramic body to a side surface of a current carrying terminal, the cap being electrical connected to the positive electrode. The side surface and the cap are joined (61) including a reaction layer by a metallized layer with an active metal (6) with the ceramic substrate and a brazing material (65) The side surface and the sleeve are joined together by a glassy metallized layer (7) including a glass component, which is adhered to the ceramic substrate, and a metallized component and a brazing filler metal (75)