A heater has a cylindrical metallic shell, a heater body partly disposed in
a front end portion of the metallic shell, an electrode disposed in a rear
portion of the metallic shell and electrically connected to the heater
body, and a terminal adapted to be capped with an electric connector. The
terminal includes a terminal body for power supply to the heater body
through the electrode and an engaging portion formed on an outer
circumferential surface of the terminal body so as to be engageable with
the electric connector. The electrode and the terminal body are formed
integrally with each other. Such a heater can maintain good electrical
conduction from the terminal to the heater body with its simple structure
throughout an extended period of time.
