A pneumatic tire comprising: stud pins (50A, 50B, 50C) fitted into stud pin installation holes of a tread portion of the pneumatic tire; the stud pins (50A, 50B, 50C) each comprising: a buried base portion (52A, 52B, 52C) being embedded in the tread portion of the pneumatic tire and extending in a tire radial direction; and a tip portion (60A, 60B, 60C) protruding from a road contact surface of the tread portion upon embedding of the buried base portion (52A, 52B, 52C) into the tread portion; the tip portion (60A, 60B, 60C) having a tip surface (60a, 60b, 60c) longer in a tire width direction than in a tire circumferential direction; the tip surface (60a, 60b, 60c) having a contour formed by: a first protrusion portion and a second protrusion portion protruding toward one side in the tire circumferential direction; a first recessed portion disposed between the first protrusion portion and the second protrusion portion and recessed toward the other side in the tire circumferential direction; a third protrusion portion and a fourth protrusion portion protruding toward the other side in the tire circumferential direction; and a second recessed portion disposed between the third protrusion portion and the fourth protrusion portion and recessed toward the one side in the tire circumferential direction; the first recessed portion and the second recessed portion being each formed by a pair of adjacent sides of the tip surface (60a, 60b, 60c); and one of the pair of adjacent sides inclining relative to the tire width direction at an angle greater than 0 degrees and less than 90 degrees, and another one of the pair of adjacent sides inclining in an opposite direction to the inclining direction of the one of the pair of adjacent sides relative to the tire width direction at an angle greater than 0 degrees and less than 90 degrees. stud pins (50A, 50B, 50C) fitted into stud pin installation holes of a tread portion of the pneumatic tire; the stud pins (50A, 50B, 50C) each comprising: a buried base portion (52A, 52B, 52C) being embedded in the tread portion of the pneumatic tire and extending in a tire radial direction; and a tip portion (60A, 60B, 60C) protruding from a road contact surface of the tread portion upon embedding of the buried base portion (52A, 52B, 52C) into the tread portion; a buried base portion (52A, 52B, 52C) being embedded in the tread portion of the pneumatic tire and extending in a tire radial direction; and a tip portion (60A, 60B, 60C) protruding from a road contact surface of the tread portion upon embedding of the buried base portion (52A, 52B, 52C) into the tread portion; the tip portion (60A, 60B, 60C) having a tip surface (60a, 60b, 60c) longer in a tire width direction than in a tire circumferential direction; the tip surface (60a, 60b, 60c) having a contour formed by: a first protrusion portion and a second protrusion portion protruding toward one side in the tire circumferential direction; a first recessed portion disposed between the first protrusion portion and the second protrusion portion and recessed toward the other side in the tire circumferential direction; a third protrusion portion and a fourth protrusion portion protruding toward the other side in the tire circumferential direction; and a second recessed portion disposed between the third protrusion portion and the fourth protrusion portion and recessed toward the one side in the tire circumferential direction; a first protrusion portion and a second protrusion portion protruding toward one side in the tire circumferential direction; a first recessed portion disposed between the first protrusion portion and the second protrusion portion and recessed toward the other side in the tire circumferential direction; a third protrusion portion and a fourth protrusion portion protruding toward the other side in the tire circumferential direction; and a second recessed portion disposed between the third protrusion portion and the fourth protrusion portion and recessed toward the one side in the tire circumferential direction; the first recessed portion and the second recessed portion being each formed by a pair of adjacent sides of the tip surface (60a, 60b, 60c); and one of the pair of adjacent sides inclining relative to the tire width direction at an angle greater than 0 degrees and less than 90 degrees, and another one of the pair of adjacent sides inclining in an opposite direction to the inclining direction of the one of the pair of adjacent sides relative to the tire width direction at an angle greater than 0 degrees and less than 90 degrees.