A pneumatic tire rotatable about a rotation axis upon the pneumatic tire being mounted on a rim, the pneumatic tire comprising: a tread portion comprising grooves (10, 11, 12) formed into a predetermined pattern design; a sidewall portion adjacent to a boundary portion of the tread portion in a tire lateral direction and comprising a surface on which a maximum tire width position is located; and a serration portion comprising a plurality of ridges shaped into lines in a plane orthogonal to the rotation axis, the plurality of ridges each comprising a radial end portion, and the plurality of ridges being arranged at intervals in a tire circumferential direction on the surface of the sidewall portion; the serration portion comprising first ridge groups and second ridge groups, the first ridge groups each comprising a plurality of first ridges arranged adjacent to each other in the tire circumferential direction, each of the ridges of said plurality of first ridges comprising said radial end portion whose distance from the rotation axis gradually changes, the second ridge groups each comprising a plurality of second ridges arranged adjacent to each other in the tire circumferential direction, and each of the ridges of said plurality of second ridges comprising said radial end portion whose distance from the rotation axis gradually changes; the first ridge groups and the second ridge groups being adjacent to each other in the tire circumferential direction; characterized in that the radial end portion of a first ridge of the plurality of first ridges located farthest on a first side in the tire circumferential direction in each of the first ridge groups is located on one of an inside and an outside of the maximum tire width position in a tire radial direction, and the radial end portion of a first ridge of the plurality of first ridges located farthest on a second side in the tire circumferential direction is located on the other of the inside and the outside of the maximum tire width position in the tire radial direction; and the radial end portion of a second ridge of the plurality of second ridges located farthest on the first side in the tire circumferential direction in each of the second ridge groups is located on one of the inside and the outside of the maximum tire width position in the tire radial direction, and the radial end portion of a second ridge of the plurality of second ridges located farthest on the second side in the tire circumferential direction is located on the other of the inside and the outside of the maximum tire width position in the tire radial direction. a tread portion comprising grooves (10, 11, 12) formed into a predetermined pattern design; a sidewall portion adjacent to a boundary portion of the tread portion in a tire lateral direction and comprising a surface on which a maximum tire width position is located; and a serration portion comprising a plurality of ridges shaped into lines in a plane orthogonal to the rotation axis, the plurality of ridges each comprising a radial end portion, and the plurality of ridges being arranged at intervals in a tire circumferential direction on the surface of the sidewall portion; the serration portion comprising first ridge groups and second ridge groups, the first ridge groups each comprising a plurality of first ridges arranged adjacent to each other in the tire circumferential direction, each of the ridges of said plurality of first ridges comprising said radial end portion whose distance from the rotation axis gradually changes, the second ridge groups each comprising a plurality of second ridges arranged adjacent to each other in the tire circumferential direction, and each of the ridges of said plurality of second ridges comprising said radial end portion whose distance from the rotation axis gradually changes; the first ridge groups and the second ridge groups being adjacent to each other in the tire circumferential direction; characterized in that the radial end portion of a first ridge of the plurality of first ridges located farthest on a first side in the tire circumferential direction in each of the first ridge groups is located on one of an inside and an outside of the maximum tire width position in a tire radial direction, and the radial end portion of a first ridge of the plurality of first ridges located farthest on a second side in the tire circumferential direction is located on the other of the inside and the outside of the maximum tire width position in the tire radial direction; and the radial end portion of a second ridge of the plurality of second ridges located farthest on the first side in the tire circumferential direction in each of the second ridge groups is located on one of the inside and the outside of the maximum tire width position in the tire radial direction, and the radial end portion of a second ridge of the plurality of second ridges located farthest on the second side in the tire circumferential direction is located on the other of the inside and the outside of the maximum tire width position in the tire radial direction.