A pneumatic tire, wherein the tire has a tread partitioned into a plurality of land portions (12A, 12B, 12C, 12D) that are continuous in a tire circumferential direction, by a plurality of circumferential grooves (11a, 11b, 11c, 11d) extending in the tire circumferential direction, the land portions (12A, 12B, 12C, 12D) continuous in the tire circumferential direction are divided into a plurality of blocks (14A, 14B, 14C, 14D) by a plurality of widthwise grooves (13a, 13b, 13c, 13d) extending in a tire widthwise direction, and the blocks (14A, 14B, 14C, 14D) are segmented into a plurality of segmented blocks (14Ap, 14Bp, 14Cp, 14Dp) by a plurality of widthwise sipes extending in the tire widthwise direction, one inner side circumferential groove of the circumferential grooves (11a, 11b, 11c, 11d) is formed on a tire equator line (Lc) in the middle in the tire widthwise direction, two pairs of inner side circumferential grooves (11b, 11c) are formed on both sides of the inner side circumferential groove in a symmetrical relation with respect to the tire equator line (Lc), a pair of outermost side circumferential grooves are formed on outermost sides in the tire widthwise direction, the inner side circumferential grooves (11a, 11b, 11c) have a groove width that is smaller than a groove width of the outermost side circumferential grooves and that allows the land portions on opposite sides of the inner side circumferential grooves to come into contact with each other upon grounding, a pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) opposed to each other in the widthwise grooves (13a, 13b, 13c) provided between the pair of outermost side circumferential grooves (11d, 11d), the land portions (12A, 12B, 12C) provided between the pair of outermost side circumferential grooves (11d, 11d) include an outer side land portion partitioned by the outermost side circumferential groove and the inner side circumferential groove, and inner side land portions (12A, 12B) partitioned on the opposite sides thereof by the inner side circumferential grooves (11a, 11b; 11b, 11c), characterized in that: said pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) are bent at bent portions (Kp, Kq), and the bent portions (Kp, Kq) formed on the groove side faces (13ap, 13aq; 13bp, 13bq) of the inner side widthwise grooves (13a, 13b) that divide the inner side land portions (12A, 12B) are greater in number than the bent portions (Kp, Kq) formed on the groove side faces (13cp, 13cq) of the outer side widthwise grooves that divide the outer side land portion. the tire has a tread partitioned into a plurality of land portions (12A, 12B, 12C, 12D) that are continuous in a tire circumferential direction, by a plurality of circumferential grooves (11a, 11b, 11c, 11d) extending in the tire circumferential direction, the land portions (12A, 12B, 12C, 12D) continuous in the tire circumferential direction are divided into a plurality of blocks (14A, 14B, 14C, 14D) by a plurality of widthwise grooves (13a, 13b, 13c, 13d) extending in a tire widthwise direction, and the blocks (14A, 14B, 14C, 14D) are segmented into a plurality of segmented blocks (14Ap, 14Bp, 14Cp, 14Dp) by a plurality of widthwise sipes extending in the tire widthwise direction, one inner side circumferential groove of the circumferential grooves (11a, 11b, 11c, 11d) is formed on a tire equator line (Lc) in the middle in the tire widthwise direction, two pairs of inner side circumferential grooves (11b, 11c) are formed on both sides of the inner side circumferential groove in a symmetrical relation with respect to the tire equator line (Lc), a pair of outermost side circumferential grooves are formed on outermost sides in the tire widthwise direction, the inner side circumferential grooves (11a, 11b, 11c) have a groove width that is smaller than a groove width of the outermost side circumferential grooves and that allows the land portions on opposite sides of the inner side circumferential grooves to come into contact with each other upon grounding, a pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) opposed to each other in the widthwise grooves (13a, 13b, 13c) provided between the pair of outermost side circumferential grooves (11d, 11d), the land portions (12A, 12B, 12C) provided between the pair of outermost side circumferential grooves (11d, 11d) include an outer side land portion partitioned by the outermost side circumferential groove and the inner side circumferential groove, and inner side land portions (12A, 12B) partitioned on the opposite sides thereof by the inner side circumferential grooves (11a, 11b; 11b, 11c), characterized in that: said pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) are bent at bent portions (Kp, Kq), and the bent portions (Kp, Kq) formed on the groove side faces (13ap, 13aq; 13bp, 13bq) of the inner side widthwise grooves (13a, 13b) that divide the inner side land portions (12A, 12B) are greater in number than the bent portions (Kp, Kq) formed on the groove side faces (13cp, 13cq) of the outer side widthwise grooves that divide the outer side land portion. said pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) are bent at bent portions (Kp, Kq), and the bent portions (Kp, Kq) formed on the groove side faces (13ap, 13aq; 13bp, 13bq) of the inner side widthwise grooves (13a, 13b) that divide the inner side land portions (12A, 12B) are greater in number than the bent portions (Kp, Kq) formed on the groove side faces (13cp, 13cq) of the outer side widthwise grooves that divide the outer side land portion.