A tire comprising a tread portion, wherein the tread portion includes a plurality of circumferential grooves extending continuously in a tire circumferential direction, the circumferential grooves include a pair of shoulder circumferential grooves, and at least one middle circumferential groove disposed between the pair of shoulder circumferential grooves, a groove depth of the middle circumferential groove is less than a groove depth of each of the shoulder circumferential grooves, and in a groove bottom of the middle circumferential groove, a circumferential sipe extending inwardly from the groove bottom in a tire radial direction, and a circumferential width-increased portion extending inwardly from the circumferential sipe in the tire radial direction and extending in the tire circumferential direction with a width greater than a width of the circumferential sipe, are formed, the tread portion includes land portions demarcated by the circumferential grooves, and the land portions include two or more inner land portions demarcated by the middle circumferential groove between the pair of shoulder circumferential grooves, characterized in that at least one of the inner land portions includes an axial sipe extending in the tire axial direction, and an axial width-increased portion extending inwardly from the axial sipe in the tire radial direction and extending in the tire axial direction with a width greater than a width of the axial sipe. a tread portion, wherein the tread portion includes a plurality of circumferential grooves extending continuously in a tire circumferential direction, the circumferential grooves include a pair of shoulder circumferential grooves, and at least one middle circumferential groove disposed between the pair of shoulder circumferential grooves, a groove depth of the middle circumferential groove is less than a groove depth of each of the shoulder circumferential grooves, and in a groove bottom of the middle circumferential groove, a circumferential sipe extending inwardly from the groove bottom in a tire radial direction, and a circumferential width-increased portion extending inwardly from the circumferential sipe in the tire radial direction and extending in the tire circumferential direction with a width greater than a width of the circumferential sipe, are formed, the tread portion includes land portions demarcated by the circumferential grooves, and the land portions include two or more inner land portions demarcated by the middle circumferential groove between the pair of shoulder circumferential grooves, the tread portion includes a plurality of circumferential grooves extending continuously in a tire circumferential direction, the circumferential grooves include a pair of shoulder circumferential grooves, and at least one middle circumferential groove disposed between the pair of shoulder circumferential grooves, a groove depth of the middle circumferential groove is less than a groove depth of each of the shoulder circumferential grooves, and in a groove bottom of the middle circumferential groove, a circumferential sipe extending inwardly from the groove bottom in a tire radial direction, and a circumferential width-increased portion extending inwardly from the circumferential sipe in the tire radial direction and extending in the tire circumferential direction with a width greater than a width of the circumferential sipe, are formed, the tread portion includes land portions demarcated by the circumferential grooves, and the land portions include two or more inner land portions demarcated by the middle circumferential groove between the pair of shoulder circumferential grooves, characterized in that at least one of the inner land portions includes an axial sipe extending in the tire axial direction, and an axial width-increased portion extending inwardly from the axial sipe in the tire radial direction and extending in the tire axial direction with a width greater than a width of the axial sipe.