Pneumatic tire

A pneumatic tire comprising:

• a plurality of circumferential main grooves extending in a tire circumferential direction, a plurality of lug grooves extending in a tire width direction, and blocks partitioned by the plurality of circumferential main grooves and the plurality of lug grooves, wherein
• the blocks include a first sipe and a second sipe, each extending in the tire width direction and disposed at a predetermined pitch in the tire circumferential direction;
• the first sipe and the second sipe each include a first sipe portion having a linear form when the block is viewed planarly, a second sipe portion having a zigzag shape when the block is viewed planarly and that connects to the first sipe portion, and a third sipe portion having a linear form when the block is viewed planarly and that connects to the second sipe portion;
• the first sipe portion includes a pair of first sipe wall faces that face each other and have a linear form when viewed as a cross-section from a direction perpendicular to a sipe length direction, and includes a protrusion disposed on a first face of the first sipe wall faces and a recess disposed on a second face of the first sipe wall faces so as to mate with the protrusion;
• the first sipe portion of the first sipe and the third sipe portion of the second sipe open to one of the circumferential main grooves of the left and right circumferential main grooves that partition the blocks, and the third sipe portion of the first sipe and the first sipe portion of the second sipe open to the other circumferential main groove;
• a sipe depth D1 of the first sipe portion of the first and second sipes and a sipe depth D2 of the third sipe portion of the first and second sipes have a relationship such that D2/D1≦0.5;
• when viewed as a cross-section from a direction perpendicular to the sipe length direction, the second sipe portion has a pair of second sipe wall faces that have a form bent in a sipe width direction, and are mutually opposing so as to mate;
• and
• when viewed as a cross-section from a direction perpendicular to the sipe length direction, the third sipe portion has a pair of third sipe wall faces that have a linear form, and do not include a protrusion and a recess.