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.