A pneumatic tire, comprising: four or more circumferential main grooves (21, 22, 23, 24) extending in a tire circumferential direction; and five or more land portions (31, 32, 33, 34, 35) defined by the circumferential main grooves (21, 22, 23, 24); wherein left and right circumferential main grooves (21, 24) of the circumferential main grooves (21, 22, 23, 24) located at an outermost side in a tire lateral direction are defined as outermost circumferential main grooves (21, 24), left and right land portions (31, 35) of the land portions (31, 32, 33, 34, 35) located on a tire equatorial plane side and axially delimited by the outermost circumferential main grooves (21, 24) are defined as second land portions (32, 34); one of the second land portions (32, 34) comprises a circumferential narrow groove extending in the tire circumferential direction and a plurality of sets of first lug grooves and second lug grooves extending in the tire lateral direction and extending through the circumferential narrow groove; one end portion of the first lug groove opens to one edge portion of the one second land portion, and another end portion terminates within the one second land portion; one end of the second lug groove opens to another edge portion of the one second land portion, and another end terminates within the one second land portion; the first lug groove and the second lug groove are alternately arranged in the tire circumferential direction; the circumferential main groove on a tire equatorial plane side axially delimiting the other second land portion has a bent shape with an amplitude in the tire lateral direction and comprises a bent portion; and the other second land portion comprises a lug groove opening to a position facing the bent portion, and wherein the other second land portion comprises a block defined by a plurality of the lug grooves, characterized in that the block comprises a circumferential narrow groove that extends in the tire circumferential direction and opens to the lug groove at one end and terminates within the block at another end, and the bent portion of the circumferential main groove on a tire equatorial plane side axially delimiting the other second land portion is provided with an acute angle of bending at an edge portion on a tire equatorial plane side. four or more circumferential main grooves (21, 22, 23, 24) extending in a tire circumferential direction; and five or more land portions (31, 32, 33, 34, 35) defined by the circumferential main grooves (21, 22, 23, 24); wherein left and right circumferential main grooves (21, 24) of the circumferential main grooves (21, 22, 23, 24) located at an outermost side in a tire lateral direction are defined as outermost circumferential main grooves (21, 24), left and right land portions (31, 35) of the land portions (31, 32, 33, 34, 35) located on a tire equatorial plane side and axially delimited by the outermost circumferential main grooves (21, 24) are defined as second land portions (32, 34); one of the second land portions (32, 34) comprises a circumferential narrow groove extending in the tire circumferential direction and a plurality of sets of first lug grooves and second lug grooves extending in the tire lateral direction and extending through the circumferential narrow groove; one end portion of the first lug groove opens to one edge portion of the one second land portion, and another end portion terminates within the one second land portion; one end of the second lug groove opens to another edge portion of the one second land portion, and another end terminates within the one second land portion; the first lug groove and the second lug groove are alternately arranged in the tire circumferential direction; the circumferential main groove on a tire equatorial plane side axially delimiting the other second land portion has a bent shape with an amplitude in the tire lateral direction and comprises a bent portion; and the other second land portion comprises a lug groove opening to a position facing the bent portion, and wherein the other second land portion comprises a block defined by a plurality of the lug grooves, characterized in that the block comprises a circumferential narrow groove that extends in the tire circumferential direction and opens to the lug groove at one end and terminates within the block at another end, and the bent portion of the circumferential main groove on a tire equatorial plane side axially delimiting the other second land portion is provided with an acute angle of bending at an edge portion on a tire equatorial plane side.