A pneumatic tire comprising: a tread portion having a specified rotational direction, the tread portion comprising a pair of middle land portions each of which is defined between a circumferentially and continuously extending crown main groove and a circumferentially and continuously extending shoulder main groove disposed axially outward of the crown main groove, wherein the crown main groove is one disposed on a tire equator (c) or, alternatively, a pair disposed on both sides of the tire equator; each of the middle land portions being formed into a plurality of middle blocks divided by a plurality of middle lateral grooves that communicate between the crown main groove and the shoulder main groove; each of the middle blocks being provided with a middle narrow groove extending forward in the rotational direction from the middle lateral groove which is adjacent backward in the rotational direction of the middle block, an inner sipe disposed axially inward of the middle narrow groove and an outer sipe disposed axially outward of the middle narrow groove; the inner sipe extending axially inwardly from the middle narrow groove while inclining backwardly in the rotational direction; the outer sipe extending axially outwardly from the middle narrow groove while inclining backwardly in the rotational direction; and characterized in that the middle narrow groove has a width (W6a) in a range of from 1.7 to 4.0 mm and terminates without reaching the middle lateral groove that is adjacent forward in the rotational direction of the middle block, wherein each of the inner sipes and the outer sipes has an angle (α7a, α7b) in a range of from 5 to 30 degrees with respect to a tire axial direction. a tread portion having a specified rotational direction, the tread portion comprising a pair of middle land portions each of which is defined between a circumferentially and continuously extending crown main groove and a circumferentially and continuously extending shoulder main groove disposed axially outward of the crown main groove, wherein the crown main groove is one disposed on a tire equator (c) or, alternatively, a pair disposed on both sides of the tire equator; each of the middle land portions being formed into a plurality of middle blocks divided by a plurality of middle lateral grooves that communicate between the crown main groove and the shoulder main groove; each of the middle blocks being provided with a middle narrow groove extending forward in the rotational direction from the middle lateral groove which is adjacent backward in the rotational direction of the middle block, an inner sipe disposed axially inward of the middle narrow groove and an outer sipe disposed axially outward of the middle narrow groove; the inner sipe extending axially inwardly from the middle narrow groove while inclining backwardly in the rotational direction; the outer sipe extending axially outwardly from the middle narrow groove while inclining backwardly in the rotational direction; and characterized in that the middle narrow groove has a width (W6a) in a range of from 1.7 to 4.0 mm and terminates without reaching the middle lateral groove that is adjacent forward in the rotational direction of the middle block, wherein each of the inner sipes and the outer sipes has an angle (α7a, α7b) in a range of from 5 to 30 degrees with respect to a tire axial direction.