A pneumatic tire whose steering stability on dry roads is improved with minimizing lowering of on-snow performances and which has round shoulders and comprises tread portion (2) divided by circumferential main grooves (3) and lateral grooves (4) into blocks (5) provided with sipes (6) each having zigzag part (8), the circumferential grooves (3) including at least a pair of axially outermost circumferential grooves (3o) to divide the tread portion (2) into shoulder regions (Ysh) and crown region (Ycr), wherein the zigzag part (8) of sipes (6sh) disposed in the shoulder regions (Ysh) has a larger zigzag amplitude (Wsh) and a larger zigzag pitch (Psh) than zigzag amplitude (Wcr) and zigzag pitch (Pcr) of the zigzag part (8) of sipes (6cr) disposed in the crown region (Ycr), and angle ( sh) of the sipes (6sh) with respect to the axial direction is smaller than angle ( cr) of the sipes (6cr) with respect to the axial direction.