Pneumatic tire

It is an object of the present invention to improve the running performance on snowy and icy roads, and for this purpose, blocks provided with sipes are formed at a tread portion. The sipes (9A,9B) include an open top (Up) end that opens at a block surface (7S) and a bottom (Bo), and a configuration of the sipes (9A,9B) in a plane parallel with the block surface (7S) comprises a zigzag part (9a) extending in the length direction of the sipes. The zigzag part (9a) displaces upon turning back to one side and to the other side in a length direction of the sipes in the course from the open top end (Up) to the bottom (Bo). At least one block includes a first sipe (9A) and a second sipe (9B) which depths (d) of the turn-back points (11a,11b) of displacement from the open top end and/or positions of the turn-back points of displacement in the length direction differ from each other.