| 摘要 |
<p>A spark plug includes a rod-shaped center electrode (100) extending in an axial direction, a tubular insulator (200) having an axial hole (290) and holding the center electrode (100) in the axial hole (290), a tubular metallic shell (300) having an end surface (310) an inner circumferential surface (392), and a gap (IG) is formed between the inner circumferential surface (392) and a forward end portion of the insulator (200). A ground electrode (400) is welded to the end surface (310). A method of manufacturing the spark plug includes a welding step of welding the ground electrode (400) to the end surface (310); and a shaping step which is performed after the welding step so as to form the inner circumferential surface (392), through shaping, on the metallic shell (300) having the ground electrode (400) welded to the end surface (310) thereof.
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