| 摘要 |
<p>The level of radio noise generated from a spark plug is reduced while deterioration of sparking performance is suppressed. The spark plug includes an insulator having an axial bore extending in an axial direction; a center electrode disposed at one end of the axial bore; a metal terminal disposed at the other end of the axial bore; and a connecting portion that electrically connects the center electrode with the metal terminal within the axial bore. The connecting portion of the spark plug includes a resistor. A center electrode-side resistance, which is the resistance of a portion of the resistor that extends from the center thereof toward the center electrode in the axial direction, is larger than a metal terminal-side resistance, which is the resistance of a portion of the resistor that extends from the center thereof toward the metal terminal.</p> |
