Patent ID: 8772677

Claim:
A glow plug having a configuration in which a heater element generating heat upon supply of electric current thereto is positioned frontward or at a leading end of a tubular body, one of electrodes of the heater element is electrically connected to a metallic lead shaft member positioned inside the body and rearward with respect to the heater element, a rear end of the lead shaft member is inserted into an attachment hole opened at a leading end side of an external terminal having a plating layer thereon, and the external terminal is crimped to be fixed to the rear end of the lead shaft member, characterized in that the external terminal is crimped to form a plastically deformed crimp portion so that an outer peripheral face thereof in cross section is shaped into a form close to a circle from a polygon shape before crimping, whereby the external terminal is fixed to the rear end of the lead shaft member, the crimp portion has an outer peripheral face close to a circle in cross section and said plating layer at the crimp portion is resistant to plating breaks and peeling.