| 摘要 |
This invention provides a spark plug featuring good durability to solve a problem. The spark plug includes a tip provided on at least one of a center electrode and a ground electrode. The spark plug is achieved by reducing oxidative consumption without an influence from oxygen concentration under an environment of this tip being exposed. The spark plug includes a center electrode and a ground electrode disposed providing a gap with the center electrode. At least one of the center electrode and the ground electrode includes a tip forming the gap. The tip has a main constituent of Ir. The tip contains Rh of 7 mass% or more to 31 mass% or less, Ru of 5 mass% or more to 20 mass% or less, and Pt of one-twentieth or more to one-half or less of a Ru content. |
