A studless tire capable of suppressing a vehicle from staggering at the time of braking on icy and snow-covered roads, including a tread portion 2 provided with at least six block rows R1 to R4, wherein each block B is provided with sipes having a depth of at least 3.0 mm, and the block rows comprises at least two crown block rows CR disposed in a crown region Ac extending from the tire equator C as its center to have a width of 50% of the tread width TW, and at least two shoulder block rows Sh disposed on each axially outer side of the crown block rows CR, and wherein lateral grooves 4 provided in a block row are inclined in the opposite direction, with respect to the axial direction, to lateral grooves provided in an axially adjacent block row.