A pneumatic tire comprising a tread portion provided with: a pair of circumferentially and continuously extending center main grooves to define a center portion therebetween; a pair of circumferentially and continuously extending shoulder main grooves disposed axially outwardly of the center main grooves to define a middle portion between the center main groove and the shoulder main groove and a shoulder portion between the shoulder main groove and a tread edge (Te), in each side of a tire equator (c), the shoulder main grooves extending in a trapezoid wave manner that comprises a circumferentially extending axially outer part, a circumferentially extending axially inner part arranged axially inwardly of the axially outer part, and an inclined part connecting between the axially outer part and the axially inner part; the shoulder portion being provided with a plurality of shoulder lateral grooves that extend beyond the tread edge (Te) from the shoulder main groove to define a plurality of shoulder blocks; and each of the shoulder lateral grooves having an axially inner end connected to the axially outer part of the shoulder main groove so as to include an outer corner point (Ko) between the axially outer part and the inclined part, each of the shoulder lateral grooves having an axially inner portion that extends from the axially inner end with an angle α1 in a range of from 10 to 30 degrees with respect to an axial direction of the tire, each of the shoulder lateral grooves having cross sectional area increasing toward the tread edge (Te), wherein the shoulder lateral groove comprises the axially inner portion, an axially middle portion connected to the axially inner portion, the axially middle portion having an angle α2 with respect to the axial direction of the tire larger than the angle α1 of the axially inner portion, and an axially outer portion connected to the axially middle portion, the axially outer portion having an angle α3 with respect to the axial direction of the tire smaller than the angle α2 of the axially middle portion, characterized in that the axially inner portion is provided with a tie-bar, and a boundary between the axially middle portion and the axially outer portion is located outward a region where the axially inner portion is extended beyond the boundary. a pair of circumferentially and continuously extending center main grooves to define a center portion therebetween; a pair of circumferentially and continuously extending shoulder main grooves disposed axially outwardly of the center main grooves to define a middle portion between the center main groove and the shoulder main groove and a shoulder portion between the shoulder main groove and a tread edge (Te), in each side of a tire equator (c), the shoulder main grooves extending in a trapezoid wave manner that comprises a circumferentially extending axially outer part, a circumferentially extending axially inner part arranged axially inwardly of the axially outer part, and an inclined part connecting between the axially outer part and the axially inner part; the shoulder portion being provided with a plurality of shoulder lateral grooves that extend beyond the tread edge (Te) from the shoulder main groove to define a plurality of shoulder blocks; and each of the shoulder lateral grooves having an axially inner end connected to the axially outer part of the shoulder main groove so as to include an outer corner point (Ko) between the axially outer part and the inclined part, each of the shoulder lateral grooves having an axially inner portion that extends from the axially inner end with an angle α1 in a range of from 10 to 30 degrees with respect to an axial direction of the tire, each of the shoulder lateral grooves having cross sectional area increasing toward the tread edge (Te), wherein the shoulder lateral groove comprises the axially inner portion, an axially middle portion connected to the axially inner portion, the axially middle portion having an angle α2 with respect to the axial direction of the tire larger than the angle α1 of the axially inner portion, and an axially outer portion connected to the axially middle portion, the axially outer portion having an angle α3 with respect to the axial direction of the tire smaller than the angle α2 of the axially middle portion, characterized in that the axially inner portion is provided with a tie-bar, and a boundary between the axially middle portion and the axially outer portion is located outward a region where the axially inner portion is extended beyond the boundary.