A pneumatic tire comprising; a tread; a pair of sidewalls that extend from ends, respectively, of the tread almost inward in a radial direction; a pair of clinches disposed inward of the sidewalls, respectively, in the radial direction; a pair of beads disposed inward of the clinches, respectively, in an axial direction; and a carcass extended, along inner sides of the tread and the sidewalls, on and between one of the beads and the other of the beads, wherein a profile of the tire includes a ground-contact surface, and a pair of side surfaces that extend from the ground-contact surface almost inward in the radial direction, a maximum value of a distance, in the axial direction, between both the side surfaces represents a maximum width of the tire, when: a boundary between the ground-contact surface and each side surface is a point PB; a point, on the side surface, representing the maximum width is a point PW; an imaginary straight line that extends through each point PW in the axial direction is a first reference line; a length, in the radial direction, from the first reference line to an equator is a first reference length; a point, on the side surface, which is disposed outward of the point PW in the radial direction, and which is distant from the first reference line in the radial direction, by a length corresponding to 1/3 of the first reference length, is a point PU1; a point, on the side surface, which is disposed outward of the point PU1 in the radial direction, and which is distant from the point PU1 in the radial direction, by a length corresponding to 1/3 of the first reference length, is a point PU2; a point, on the side surface, disposed at a mid-position between the point PU2 and the point PU1 in the radial direction, is a point PU3; a point, on the side surface, disposed at a mid-position between the point PU2 and the point PB in the radial direction, is a point PU4; an end point of the side surface is a point PT, which represents a toe of the tire; an imaginary straight line that extends through each point PT in the axial direction is a second reference line; a length, in the radial direction, from the second reference line to the equator represents a cross-sectional height of the tire; a length, in the radial direction, from the second reference line to the point PW is a second reference length; a point, on the side surface, which is disposed inward of the point PW in the radial direction, and which is distant from the first reference line in the radial direction, by a length corresponding to 1/3 of the second reference length, is a point PL1; a point, on the side surface, which is disposed inward of the point PL1 in the radial direction, and which is distant from the first reference line in the radial direction, by a length corresponding to 11/20 of the second reference length, is a point PL2; and a thickness of each sidewall at the point PW is a reference thickness, a zone from the point PB to the point PW on each side surface is formed by three main arcs, the main arcs are a first main arc, a second main arc that extends almost outward from the first main arc in the radial direction, and a third main arc that extends almost outward from the second main arc further in the radial direction, the first main arc extends through the point PW and the point PU1, the second main arc extends through the point PU1, the point PU3, and the point PU2, the third main arc extends through the point PU2, the point PU4, and the point PB, a ratio of a radius of curvature of the second main arc to a radius of curvature of the first main arc is greater than or equal to 1.45 and not greater than 3.26, a ratio of a radius of curvature of the third main arc to the radius of curvature of the first main arc is greater than or equal to 0.45 and not greater than 0.56, an extension line from the first main arc extends through an imaginary point PU5 defined such that the imaginary point PU5 and the point PU1 are line-symmetric with respect to the first reference line, a zone from the point PW to the point PL2 on each side surface is formed by a fourth main arc, the fourth main arc extends through the point PW, the point PL1, and the point PL2, an extension line from the fourth main arc extends through an imaginary point PL3 defined such that the imaginary point PL3 and the point PL1 are line-symmetric with respect to the first reference line, each sidewall has a first recess and a second recess that are recessed inward from the side surface, the first recess is disposed outward of the point PW in the radial direction, the second recess is disposed inward of the point PW in the radial direction, a ratio of a length SU, in the radial direction, from the first reference line to a bottom of the first recess, relative to the cross-sectional height, is greater than or equal to 0.08 and not greater than 0.24, a ratio of a length SL, in the radial direction, from the first reference line to a bottom of the second recess, relative to the cross-sectional height, is greater than or equal to 0.08 and not greater than 0.24, a ratio of a depth TU of the first recess to the reference thickness is greater than or equal to 0.16 and not greater than 0.48, and a ratio of a depth TL of the second recess to the reference thickness is greater than or equal to 0.16 and not greater than 0.48.