| 摘要 |
A spark plug including an insulation porcelain having a throughhole; a center electrode held at one end of the throughhole; a housing holding the insulation porcelain; a ground electrode disposed at a front end of the housing and facing the center electrode; a spark gap defined by the center electrode and the ground electrode; and at least one of the center and ground electrodes having a nobel metal member bonded to a discharging spot of its front end, wherein the nobel metal member consists of 90 wt % or more of an Ir-Rh alloy containing 1 to 60 wt % Rh and the balance substantially consisting of at least one of Pt, Pb, Ru, Au and Ni.
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