A spark plug is provided which consists of a center electrode retained within a metal shell and a ground electrode including a noble metal-made tip and a body joined to the metal shell. The noble metal-made tip is connected to the body through a fused portion that is a weld between the body and the noble metal-made tip. Portions of the noble metal-made tip and the fused portion closest to the tip of the center electrode are located within a range defined by a first line extending from the tip of the center electrode in a lateral direction of the center electrode and a second line extending from a portion of the center electrode closest to the ground electrode in a longitudinal direction of the center electrode so that they do not overlap with the tip of the center electrode both in the lateral and longitudinal directions of the center electrode.