A pneumatic tire comprising, on a tread surface: a pair of circumferential grooves extending on both sides of a tire equator; a plurality of lateral grooves each extending in a tire width direction between a rib-shaped center land row and a tread edge, the rib-shaped center land row being defined by the pair of circumferential grooves; and longitudinal grooves disposed on the outsides, in the tire width direction, of the circumferential grooves, each of the longitudinal grooves communicating between the lateral grooves that are adjacent to each other in a tire circumference direction, wherein each of the lateral grooves includes a lateral groove first portion (31, 31'), a lateral groove second portion (32, 32') disposed further outward, in the tire width direction, than the lateral groove first portion (31, 31'), and a lateral groove step portion (33, 33') connecting the lateral groove first portion (31, 31') and the lateral groove second portion (32, 32'), a groove width center (X, X') of the outer end, in the tire width direction, of the lateral groove first portion (31, 31') is disposed closer to one tire circumferential side than a groove width center (Y, Y') of the inner end, in the tire width direction, of the lateral groove second portion (32, 32'), the lateral groove step portion (33, 33') extends at an angle relative to the tire circumference direction so as to connect the outer end, in the tire width direction, of the lateral groove first portion (31, 31') and the inner end, in the tire width direction, of the lateral groove second portion (32, 32'), the longitudinal grooves extend at an angle relative to the tire circumference direction toward the side opposite the side the lateral groove step portion (33, 33') extends, the end portion on the one tire circumferential side of each of the longitudinal grooves joins an area where the lateral groove second portion and the lateral groove step portion of the lateral groove on the one tire circumferential side join together, the end portion on the other tire circumferential side of each of the longitudinal grooves joins an area where the lateral groove first portion and the lateral groove step portion of the lateral groove on the other tire circumferential side join together, the lateral groove first portion (31, 31') and the lateral groove second portion (32, 32') of each lateral groove extend to form a curve that is convex toward the other tire circumferential side, characterized in that the depth of the longitudinal grooves is shallower than the depth of the circumferential grooves. a pair of circumferential grooves extending on both sides of a tire equator; a plurality of lateral grooves each extending in a tire width direction between a rib-shaped center land row and a tread edge, the rib-shaped center land row being defined by the pair of circumferential grooves; and longitudinal grooves disposed on the outsides, in the tire width direction, of the circumferential grooves, each of the longitudinal grooves communicating between the lateral grooves that are adjacent to each other in a tire circumference direction, wherein each of the lateral grooves includes a lateral groove first portion (31, 31'), a lateral groove second portion (32, 32') disposed further outward, in the tire width direction, than the lateral groove first portion (31, 31'), and a lateral groove step portion (33, 33') connecting the lateral groove first portion (31, 31') and the lateral groove second portion (32, 32'), a groove width center (X, X') of the outer end, in the tire width direction, of the lateral groove first portion (31, 31') is disposed closer to one tire circumferential side than a groove width center (Y, Y') of the inner end, in the tire width direction, of the lateral groove second portion (32, 32'), the lateral groove step portion (33, 33') extends at an angle relative to the tire circumference direction so as to connect the outer end, in the tire width direction, of the lateral groove first portion (31, 31') and the inner end, in the tire width direction, of the lateral groove second portion (32, 32'), the longitudinal grooves extend at an angle relative to the tire circumference direction toward the side opposite the side the lateral groove step portion (33, 33') extends, the end portion on the one tire circumferential side of each of the longitudinal grooves joins an area where the lateral groove second portion and the lateral groove step portion of the lateral groove on the one tire circumferential side join together, the end portion on the other tire circumferential side of each of the longitudinal grooves joins an area where the lateral groove first portion and the lateral groove step portion of the lateral groove on the other tire circumferential side join together, the lateral groove first portion (31, 31') and the lateral groove second portion (32, 32') of each lateral groove extend to form a curve that is convex toward the other tire circumferential side, characterized in that the depth of the longitudinal grooves is shallower than the depth of the circumferential grooves.