Spark plug

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The present invention relates to a spark plug. There is provided a spark plug provided with an electrode excellent in corrosion resistance and excellent in spark erosion resistance and oxidation resistance when used with an internal combustion engine using alcohol fuel. At least one of the spark plug, the center electrode and the ground electrode is made of an electrode material containing, by mass%, at least 0.05% and at most 0.5% of rare earth elements, at least one of 1.1% and 2% .5% or less Mn, less than 0.01% Al and Cr, Si is contained in a range of Si/Mn satisfying 0.5 or more and less than 1.1, the balance being Ni and unavoidable impurities constitute.