| 摘要 |
This invention solves a problem by providing a spark plug featuring excellent durability. The spark plug includes a tip at least one of a center electrode and a ground electrode. The spark plug with excellent durability can be achieved by reducing abnormal erosion of the tip. The spark plug includes the center electrode and the ground electrode. The center electrode is 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 includes a main body portion and a front surface layer. A composition of the main body portion is Pt as a main constituent and Rh of 5 mass% or more and Ni of 0 mass% or more to less than 8 mass%. The front surface layer is disposed at least at a surface radially outside of an axial line extending in a direction from a center of the main body portion to the gap. The front surface layer contains Ni of 8 mass% or more and has a thickness of 2 µm or more. |
