A spark plug having an insulator, a metallic shell disposed around the insulator, a first ground electrode having a first surface facing a side surface of a center electrode in a radial direction so as to form a first gap, and a second ground electrode having a second surface facing the side surface of the center electrode in the radial direction so as to form a second gap. A relation 60°≦θ≦150° is satisfied, where θ is a smaller one of angles formed between a first line connecting an axial line of the center electrode and the center of the first surface and a second line connecting the axis and a center of the second surface when viewed from a forward end side toward a rear end side in the direction of the axis.