A pneumatic tire, comprising on the tread: a first tread edge (To); a plurality of main grooves each extending continuously in a tire circumferential direction; a plurality of land sections bordered by the main grooves; and lateral grooves crossing through the land sections, wherein the land sections include a first land section having the first tread edge (To), a second land section adjacent to the inner side of the first land section, and a third land section adjacent to the inner side of the second land section, the lateral grooves include a first lateral groove, a second lateral groove and a third lateral groove respectively formed in the first land section, the second land section and the third land section, each lateral groove is configured to have an outer portion (17, 20, 23) that extends from the first tread-edge side land periphery and a sipe portion (18, 21, 24) that is connected to the outer portion (17, 20, 23) and extends to the other land periphery opposite the first tread-edge side, and the lateral grooves satisfy the following formulas and, A 1 > A 2 > A 3 B 1 < B 2 < B 3 reference numerals are denoted as follows: A1: tire axial length of the outer portion of the first lateral groove A2: tire axial length of the outer portion of the second lateral groove A3: tire axial length of the outer portion of the third lateral groove B1: tire axial length of the sipe portion of the first lateral groove B2: tire axial length of the sipe portion of the second lateral groove B3: tire axial length of the sipe portion of the third lateral groove, characterized in that angle θ1 of the first lateral groove relative to a tire axial direction, angle θ2 of the second lateral groove relative to the tire axial direction, and angle θ3 of the third lateral groove relative to the tire axial direction are set to satisfy the following formula, θ1<θ 2 < θ 3 wherein the first, second and third lateral grooves (15, 19, 22) incline in the same direction relative to the tire axial direction, angles θ1, θ2, θ3 are measured at each center position of the first, second and third lateral grooves (15, 19, 22) in the tire axial direction, and angle θ1 is in the range of 0 to 15 degrees, angle θ2 is in the range of 20 to 40 degrees, and angle θ3 is in the range of 35 to 55 degrees. a first tread edge (To); a plurality of main grooves each extending continuously in a tire circumferential direction; a plurality of land sections bordered by the main grooves; and lateral grooves crossing through the land sections, wherein the land sections include a first land section having the first tread edge (To), a second land section adjacent to the inner side of the first land section, and a third land section adjacent to the inner side of the second land section, the lateral grooves include a first lateral groove, a second lateral groove and a third lateral groove respectively formed in the first land section, the second land section and the third land section, each lateral groove is configured to have an outer portion (17, 20, 23) that extends from the first tread-edge side land periphery and a sipe portion (18, 21, 24) that is connected to the outer portion (17, 20, 23) and extends to the other land periphery opposite the first tread-edge side, and the lateral grooves satisfy the following formulas and, A 1 > A 2 > A 3 B 1 < B 2 < B 3 reference numerals are denoted as follows: A1: tire axial length of the outer portion of the first lateral groove A2: tire axial length of the outer portion of the second lateral groove A3: tire axial length of the outer portion of the third lateral groove B1: tire axial length of the sipe portion of the first lateral groove B2: tire axial length of the sipe portion of the second lateral groove B3: tire axial length of the sipe portion of the third lateral groove, A1: tire axial length of the outer portion of the first lateral groove A2: tire axial length of the outer portion of the second lateral groove A3: tire axial length of the outer portion of the third lateral groove B1: tire axial length of the sipe portion of the first lateral groove B2: tire axial length of the sipe portion of the second lateral groove B3: tire axial length of the sipe portion of the third lateral groove, characterized in that angle θ1 of the first lateral groove relative to a tire axial direction, angle θ2 of the second lateral groove relative to the tire axial direction, and angle θ3 of the third lateral groove relative to the tire axial direction are set to satisfy the following formula, θ1<θ 2 < θ 3 wherein the first, second and third lateral grooves (15, 19, 22) incline in the same direction relative to the tire axial direction, angles θ1, θ2, θ3 are measured at each center position of the first, second and third lateral grooves (15, 19, 22) in the tire axial direction, and angle θ1 is in the range of 0 to 15 degrees, angle θ2 is in the range of 20 to 40 degrees, and angle θ3 is in the range of 35 to 55 degrees.