Provided are a spark plug in which the occurrence of spark blowout or the like is restrained for improvement of ignition performance, and a method of manufacturing the spark plug. A ground electrode (27 ) of the spark plug has a protrusion (28 ) which faces a center electrode (5). The distal end surface of the protrusion (28) has a noble metal tip (32) provided at the center thereof and includes an annular fusion portion (33) adjacent to the periphery of the noble metal tip (32), and an annular electrode base metal surface located externally of the annular fusion portion (33). A spark discharge gap (35) is formed between the center electrode (5) and the distal end of the protrusion (28) including the noble metal tip (32).