GLOW PLUG FOR DIESEL ENGINE AND METHOD OF MANUFACTURING THE GLOW PLUG

One end of a ceramics heater 2 is secured to one end of a metallic outer sleeve 4. The negative pole of the heater 2 is electrically connected to the metallic outer sleeve while the positive pole is connected to an external connection terminal 8 through an electrode fitting 8. The metallic outer sleeve 8 in which the heater 2 and the external connection terminal 8 are mounted is inserted into an internal bore 16 of a housing 10. After positioning the distal end of the heater 2 and a sheet surface 10a on the housing 10, the outer periphery of the housing 10 is subject to a swaging operation. An annular projection 10d is formed on the inner peripheral surface of the housing 10, and an annular recess 4c, in which the angular projection 10d is fitted, is concurrently formed in the outer peripheral surface of the metallic outer sleeve 4. The mechanic outer sleeve 4 which carries the heater 2 and the housing 10 can be secured together firmly without requiring a high precision in the internal diameter of the housing 10, allowing a reduction in the manufacturing cost.