A pneumatic tire includes a tread portion with a designated rotational direction. The tread portion is provided with a shoulder main groove arranged nearby a tread edge, a plurality of shoulder lateral grooves each extending from the shoulder main groove to the tread edge to form a plurality of shoulder blocks. Each of the shoulder blocks includes a zigzag leading edge including an external corner with a first vertex formed between a long inclined side and a short inclined side. One of the shoulder blocks is provided with a plurality of shoulder sipes extending at an angle of 0 to 20 degrees with respect to an axial direction of the tire. One of the shoulder sipes includes a deep portion and a shallow portion that is arranged so as to include a position in the axial direction of the first vertex.