| 摘要 |
A spark plug including: a center electrode ( 20 ); an insulator ( 10 ) having an axial hole ( 12 ) extending in an axial direction of the center electrode ( 20 ) and holding the center electrode ( 20 ) in the axial hole ( 12 ); a cylindrical metal shell ( 50 ) surrounding the insulator ( 10 ) and holding the insulator ( 10 ); and a ground electrode ( 30 ) having first and second end portions, an end face ( 35 ) of one end portion ( 32 ) being joined to a tip face ( 57 ) of the metal shell ( 50 ) and which is bent so that the other end portion ( 31 ) is opposed to the center electrode ( 20 ). An axial line (P) of the metal shell ( 50 ) and an axial line (O) of the insulator ( 10 ) deviate from one another so that a relationship A>B is satisfied for distances A and B as defined herein.
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