Abstract
The shortest distance (F, F′) from an end face (11A) of each ground electrode (11, 11′) to a porcelain insulator (1) is made smaller than the shortest distance (G, G′) from the end face (11A) of each ground electrode (11, 11′) to the peripheral side surface of a central electrode (2, 2′). An anti-spark consumption member (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32) is secured to a portion of the central electrode (2, 2′) in such a way that it is spaced at least a specified distance (H) of from the end face of the porcelain insulator (1).
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