A tire comprising: a tread portion having a designated mounting direction to a vehicle, the tread portion comprising an outboard tread edge (To) and an inboard tread edge (Ti) to be located on an outboard side and an inboard side of a vehicle, respectively, upon being mounted on the vehicle, circumferentially and continuously extending main grooves, and land portions divided by the main grooves; the land portions comprising an outboard shoulder land portion including the outboard tread edge (To), an outboard middle land portion arranged adjacent to the outboard shoulder land portion, an inboard shoulder land portion including the inboard tread edge (Ti), and an inboard middle land portion arranged adjacent to the inboard shoulder land portion; each of the outboard shoulder land portion, the inboard shoulder land portion, and the inboard middle land portion being provided with axially extending lateral grooves; and the outboard middle land portion being provided with outboard middle lateral grooves extending from an edge of the outboard middle land portion located on the outboard tread edge side toward the inboard tread edge (Ti), wherein the outboard middle lateral grooves are inclined with respect to a tire circumferential direction at angles (θ2) smaller than those (θ1) of the lateral grooves, characterized in that the outboard middle land portion is further provided with a circumferentially and continuously extending outboard middle longitudinal narrow groove having a groove width smaller than those of the main grooves to form a circumferentially extending inner land section on the inboard tread edge side of the outboard middle land portion, wherein the inner land section extends continuously in the tire circumferential direction. a tread portion having a designated mounting direction to a vehicle, the tread portion comprising an outboard tread edge (To) and an inboard tread edge (Ti) to be located on an outboard side and an inboard side of a vehicle, respectively, upon being mounted on the vehicle, circumferentially and continuously extending main grooves, and land portions divided by the main grooves; the land portions comprising an outboard shoulder land portion including the outboard tread edge (To), an outboard middle land portion arranged adjacent to the outboard shoulder land portion, an inboard shoulder land portion including the inboard tread edge (Ti), and an inboard middle land portion arranged adjacent to the inboard shoulder land portion; each of the outboard shoulder land portion, the inboard shoulder land portion, and the inboard middle land portion being provided with axially extending lateral grooves; and the outboard middle land portion being provided with outboard middle lateral grooves extending from an edge of the outboard middle land portion located on the outboard tread edge side toward the inboard tread edge (Ti), wherein the outboard middle lateral grooves are inclined with respect to a tire circumferential direction at angles (θ2) smaller than those (θ1) of the lateral grooves, characterized in that the outboard middle land portion is further provided with a circumferentially and continuously extending outboard middle longitudinal narrow groove having a groove width smaller than those of the main grooves to form a circumferentially extending inner land section on the inboard tread edge side of the outboard middle land portion, wherein the inner land section extends continuously in the tire circumferential direction.