| 摘要 |
PROBLEM TO BE SOLVED: To suppress an eccentric amount between a terminal metal fitting and an insulator to be small.SOLUTION: A spark plug comprises an insulator, a terminal metal fitting, and a main body metal fitting. An outer diameter of the insulator at a rear end of the main body metal fitting is 8 mm or less, and contact area of a contact face between a flat part of the insulator and the terminal metal fitting is less than 10 mm. |
