Pneumatic tire

A pneumatic tire, comprising:

• an annular tread portion extending in a tire circumferential direction;
• a pair of sidewall portions disposed on both sides of the tread portion;
• and
• a pair of bead portions disposed on an inner side in a tire radial direction of the sidewall portions,
• a side region that is adjacent to an inner side in the tire radial direction of a boundary between the tread portion and the sidewall portion being provided with a plurality of side grooves extending along the tire radial direction and a plurality of side blocks defined by the side grooves and raised from an outer surface of the sidewall portion,
• the side blocks including two types of blocks that are high blocks with a relatively high raised height and low blocks with a relatively low raised height, the high blocks and the low blocks being alternately arranged in the tire circumferential direction, a block pair including one of the high blocks and one of the low blocks adjacent to each other in the tire circumferential direction, and the high block and the low block included in the block pair are partially in contact with each other to make an end, on the inner side in the tire radial direction, of one of the side grooves positioned between the high block and the low block included in the block pair being closed, and
• in each block pair, a pair of contour lines defining edges on both sides, in the tire circumferential direction, of a top surface of the high block and a pair of contour lines defining edges on both sides, in the tire circumferential direction, of a top surface of the low block being each formed by three or more linear portions connected in the tire radial direction, a first one of the linear portions, of each of the contour lines, from the boundary being defined as a first linear portion, a second one of the linear portions being defined as a second linear portion, and a third one of the linear portions being defined as a third linear portion, the first linear portions extending in an identical direction with an angle difference being equal to or smaller than 15 degrees, one linear portions being one of the second linear portions or the third linear portions extending in an identical direction with an angle difference being equal to or smaller than 15 degrees, and other linear portions being an other one of the second linear portions or the third linear portions including a linear portion extending in a different direction with an angle difference exceeding 15 degrees.