Pneumatic tire

A pneumatic tire, comprising:

• a shoulder main groove and a center main groove disposed in one region demarcated by a tire equatorial plane;
• and
• a shoulder land portion, a middle land portion, and a center land portion defined by the shoulder main groove and the center main groove,
• the center land portion comprising a plurality of center lug grooves and a plurality of center blocks, the plurality of center lug grooves penetrating the center land portion, the plurality of center blocks being defined by the plurality of center lug grooves, the middle land portion comprising a plurality of middle lug grooves, a plurality of middle blocks, a notch portion, and a middle sipe, the plurality of middle lug grooves penetrating the middle land portion, the plurality of middle blocks being defined by the plurality of middle lug grooves, the notch portion being an edge portion on the center main groove side of each of the plurality of middle blocks and formed on an extension line of each of the plurality of center lug grooves, the middle sipe extending from the notch portion and opening to an edge portion on the shoulder main groove side of each of the plurality of middle blocks;
• wherein
• each of the plurality of center main grooves has a zigzag shape formed by alternately connecting short portions and long portions having an arc shape, and
• a groove width of the arc-shaped long portion increases as it separates from the tire equatorial plane.