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1. A pneumatic tire comprising:
a circumferential groove extending along a tire circumferential direction, a first land portion having a first wall surface which faces one side in a tire width direction of the circumferential groove, and a second land portion having a second wall surface which faces another side in the tire width direction of the circumferential groove, the circumferential groove, the first land portion and the second land portion being provided in a tread surface, the first wall surface alternately having along the tire circumferential direction a first inclined surface portion which is gradually decreased in a height thereof toward the second land portion and runs into a bottom of the circumferential groove, and a first concave portion which is depressed in a direction away from the second land portion, the second wall surface alternately having along the tire circumferential direction a second inclined surface portion which is gradually decreased in a height thereof toward the first land portion and runs into the bottom of the circumferential groove, and a second concave portion which is depressed in a direction away from the first land portion, the first land portion having a first connection portion which enters the second concave portion and is gradually increased in a height thereof toward the second land portion so as to be integrally connected to the second land portion, and a first bottom surface portion which is interposed between the first inclined surface portion and the first connection portion and constitutes the bottom of the circumferential groove, the second land portion having a second connection portion which enters the first concave portion and is gradually increased in a height thereof toward the first land portion so as to be integrally connected to the first land portion, and a second bottom surface portion which is interposed between the second inclined surface portion and the second connection portion and constitutes the bottom of the circumferential groove, the first inclined surface portion and the second inclined surface portion being alternately arranged along the tire circumferential direction while overlapping with each other in the tire width direction, and a see-through region of the circumferential groove being formed between the first inclined surface portion and the second inclined surface portion, and the bottom of the circumferential groove being formed discontinuously between the first bottom surface portion and the second bottom surface portion, wherein an inclination angle β of the first connection portion with respect to a direction normal to the tread surface passing through a ridge line between a top surface portion of the second land portion and the first connection portion is from 30 degrees to 50 degrees, and an inclination angle α of the second connection portion with respect to a direction normal to the tread surface passing through a ridge line between a top surface portion of the first land portion and the second connection portion is from 30 degrees to 50 degrees.
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