| 摘要 |
PROBLEM TO BE SOLVED: To provide a glow plug and a method of manufacturing the same in which an airtight characteristic between a housing and a heater can be easily held. SOLUTION: This glow plug 1 is comprised of a housing 5 having an inner hole 50 therein, a heater 10 press fitted and fixed in the inner hole 50 of the housing 5, and an inner shaft 4 for applying an electrical energy to the heater 10. Press fitting and fixing of the housing 5 and the heater 10 are carried out such that a fitting part 55 arranged in the inner hole 50 of the housing 5 and a press fitting part 15 arranged at an outer circumference of the heater 10 are press fitted. Either an outer circumferential surface of the press fitting part 15 or the inner circumferential surface of the fitting part 55 is provided with a corrugated surface 60 having a corrugation part 6 arranged in non- parallel with an axial direction of the glow plug 1. A surface roughness (Rz) of the corrugated surface is less than 25μm and it occupies more than 20% of a surface area of the press fitting part or the fitting part.
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