A tire , comprising: a tread part having a plurality of main grooves each continuously extending in a tire circumferential direction, and a plurality of land portions demarcated by the main grooves , wherein the main grooves include a pair of crown main grooves , the land portions include a crown land portion demarcated between the pair of crown main grooves , the crown land portion includes a plurality of first crown lug grooves each extending from one of the crown main grooves to a tire axial direction inner side and terminated within the crown land portion , a plurality of second crown lug grooves each extending from the other one of the crown main grooves to the tire axial direction inner side and terminated within the crown land portion , and a plurality of first crown sipes formed respectively at tire circumferential direction positions different from positions of the first and second crown lug grooves and each communicatively connecting the pair of crown main grooves , each of the first crown sipes includes a first side crown sipe piece extending from one of the crown main grooves to the tire axial direction inner side, a second side crown sipe piece not positioned on an extension line of the first side crown sipe piece and extending from the other one of the crown main grooves to the tire axial direction inner side, and a connecting crown sipe piece connecting the first side crown sipe piece and the second side crown sipe piece , and the connecting crown sipe piece is linearly extending characterized in that each of the first side crown sipe piece and the second side crown sipe piece is extending in an arc shape, and each of a curvature radius (R3) of the first side crown sipe piece and a curvature radius (R4) of the second side crown sipe piece is 10 to 30 mm. a tread part having a plurality of main grooves each continuously extending in a tire circumferential direction, and a plurality of land portions demarcated by the main grooves , wherein the main grooves include a pair of crown main grooves , the land portions include a crown land portion demarcated between the pair of crown main grooves , the crown land portion includes a plurality of first crown lug grooves each extending from one of the crown main grooves to a tire axial direction inner side and terminated within the crown land portion , a plurality of second crown lug grooves each extending from the other one of the crown main grooves to the tire axial direction inner side and terminated within the crown land portion , and a plurality of first crown sipes formed respectively at tire circumferential direction positions different from positions of the first and second crown lug grooves and each communicatively connecting the pair of crown main grooves , each of the first crown sipes includes a first side crown sipe piece extending from one of the crown main grooves to the tire axial direction inner side, a second side crown sipe piece not positioned on an extension line of the first side crown sipe piece and extending from the other one of the crown main grooves to the tire axial direction inner side, and a connecting crown sipe piece connecting the first side crown sipe piece and the second side crown sipe piece , and the connecting crown sipe piece is linearly extending characterized in that each of the first side crown sipe piece and the second side crown sipe piece is extending in an arc shape, and each of a curvature radius (R3) of the first side crown sipe piece and a curvature radius (R4) of the second side crown sipe piece is 10 to 30 mm. <EOS>