A pneumatic tire comprising, at least in part of a tread portion surface located between both tread ends: a plurality of main grooves extending in a tire circumferential direction; and a plurality of lateral grooves extending in a tire width direction, the lateral grooves each having one bent point so as to be in a convex shape in the tire circumferential direction between the main grooves and/or between the main groove and the tread end, the plurality of main grooves and the plurality of lateral grooves partition-forming a plurality of blocks each having a circumferential protrusion in a shape conforming to the convex shape of the lateral groove, the blocks each having at least one lateral sipe (42C, 43C, 44C) extending in the tire width direction in a shape conforming to the lateral grooves, wherein the lateral sipe (42C, 43C, 44C) is equal in tire-width-direction dimension to the block having the lateral sipe (42C, 43C, 44C) disposed therein when both are projected onto the same plane which includes the tire rotation axis and is perpendicular to the block surface, wherein an apex of the circumferential protrusion is disposed offset from the width center line of the block, characterized in that the lateral sipe (42C, 43C, 44C) is a combined lateral sipe (42C, 43C, 44C) including a pair of a first sipe component and a second sipe component, the first sipe component consisting of a first sipe (42C', 43C', 44C') having one end thereof opened to a main groove or tread end located on the apex side of the circumferential protrusion relative to the width center line of the block and the other end thereof terminated within the block or opened to a lateral groove, and the second sipe component consisting of a second sipe (42C", 43C", 44C") having one end thereof opened to the other main groove or tread end and the other end thereof terminated within the block or opened to a lateral groove, wherein the first sipe (42C', 43C', 44C') has a tire-width-direction dimensional component overlapping with a tire-width-direction dimensional component of the second sipe (42C", 43C", 44C") in a projection view obtained by projecting the first sipe (42C', 43C', 44C') and the second sipe (42C", 43C", 44C") onto the same plane which includes the tire rotation axis and is perpendicular to the block surface, and wherein the apex of the circumferential protrusion is disposed as being offset from the width center line of the block by 10% to 30% of the block width. a plurality of main grooves extending in a tire circumferential direction; and a plurality of lateral grooves extending in a tire width direction, the lateral grooves each having one bent point so as to be in a convex shape in the tire circumferential direction between the main grooves and/or between the main groove and the tread end, the plurality of main grooves and the plurality of lateral grooves partition-forming a plurality of blocks each having a circumferential protrusion in a shape conforming to the convex shape of the lateral groove, the blocks each having at least one lateral sipe (42C, 43C, 44C) extending in the tire width direction in a shape conforming to the lateral grooves, wherein the lateral sipe (42C, 43C, 44C) is equal in tire-width-direction dimension to the block having the lateral sipe (42C, 43C, 44C) disposed therein when both are projected onto the same plane which includes the tire rotation axis and is perpendicular to the block surface, wherein an apex of the circumferential protrusion is disposed offset from the width center line of the block, characterized in that the lateral sipe (42C, 43C, 44C) is a combined lateral sipe (42C, 43C, 44C) including a pair of a first sipe component and a second sipe component, the first sipe component consisting of a first sipe (42C', 43C', 44C') having one end thereof opened to a main groove or tread end located on the apex side of the circumferential protrusion relative to the width center line of the block and the other end thereof terminated within the block or opened to a lateral groove, and the second sipe component consisting of a second sipe (42C", 43C", 44C") having one end thereof opened to the other main groove or tread end and the other end thereof terminated within the block or opened to a lateral groove, wherein the first sipe (42C', 43C', 44C') has a tire-width-direction dimensional component overlapping with a tire-width-direction dimensional component of the second sipe (42C", 43C", 44C") in a projection view obtained by projecting the first sipe (42C', 43C', 44C') and the second sipe (42C", 43C", 44C") onto the same plane which includes the tire rotation axis and is perpendicular to the block surface, and wherein the apex of the circumferential protrusion is disposed as being offset from the width center line of the block by 10% to 30% of the block width.