Spark plug designed to have enhanced spark resistance and oxidation resistance

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A spark plug for an internal combustion engine is provided which is equipped with a ground electrode and a center electrode. The spark plug also has a ground electrode noble metal chip joined to the ground electrode and a center electrode noble metal chip joined to the center electrode to define a spark gap between itself and the ground electrode. At least one of the ground electrode chip and the center electrode chip is made from material containing a main component of Rh (Rhodium) and an additive of 0.3% to 2.5% by weight of one or more selected from earth rare elements, IVA elements, and VA elements. This results in enhanced resistances of the one of the center electrode and ground electrode chips to wear arising from exposure to sparks and oxidation in high-temperature environments.