| 摘要 |
In a spark plug for a spark ignited internal combustion engine, an approximately cylindrical plug body having a mounting screw portion is provided, a center electrode supported on an inside of the plug body via an insulator is provided and a side electrode connected to a tip portion of the plug body and bent toward the inside of the plug body is provided, an atmospheric discharge being carried out across a discharge gap between tip portions of the center and side electrodes, the center electrode being positioned eccentrically at an opposite side to the side electrode from a center line of the spark plug, and both of the tip portions of the center and side electrodes constituting the discharge gap being faced against each other with respect to the center line of the spark plug.
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