It is possible to determine the presence or absence of the degradation and abnormality of a glow plug with high reliability using a relatively simple procedure. A method enables the determination of the presence or absence of degradation and abnormality wi...

A ceramic heater-type glow plug is provided that is configured so that, even when a deformation occurs in a metal outer cylinder, stress propagating to the connection between one electrode of a ceramic heater and an electrode lead-out member can be reduced...