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 θsh of the sipes 6sh with respect to the axial direction is smaller than angle θcr of the sipes 6cr with respect to the axial direction.