An object of the present invention is to provide a spark plug including a tip provided on at least one of a center electrode and a ground electrode, which spark plug, even when the noble metal content of the tip is reduced as compared with conventional cas...

A technique of reducing the occurrence of multiple discharge in a spark plug is provided. The spark plug has a main ground electrode and three auxiliary ground electrodes. The position at which the first auxiliary ground electrode is joined to a metallic s...