A spark plug including: a center electrode (20); an insulator (10) having
an axial hole (12) extending in an axial direction of the center
electrode (20) and holding the center electrode (20) in the axial hole
(12); a cylindrical metal shell (50) surrounding the insulator (10) and
holding the insulator (10); and a ground electrode (30) having first and
second end portions, an end face (35) of one end portion (32) being
joined to a tip face (57) of the metal shell (50) and which is bent so
that the other end portion (31) is opposed to the center electrode (20).
An axial line (P) of the metal shell (50) and an axial line (O) of the
insulator (10) deviate from one another so that a relationship A>B is
satisfied for distances A and B as defined herein.