A passenger vehicle pneumatic radial tire comprising: a carcass composed of a carcass ply of a radially arranged cord toroidally extending between a pair of bead portions; a tread rubber provided on a tire radial outer side of the carcass; at least two circumferential main grooves continuously extending in a tire circumferential direction in a tread surface; and a plurality of land portions in the tread surface, each of which is defined by adjacent two circumferential main grooves of the at least two circumferential main grooves or by a tire widthwise outermost circumferential main groove of the at least two circumferential main grooves and a tread ground contact edge, wherein when the tire is attached to a rim and set to an internal pressure of 250 kPa or more, a ratio SW/OD between a sectional width SW and an outer diameter OD (mm) of the tire is 0.26 or less in the case where the sectional width SW of the tire is less than 165 (mm), and the sectional width SW and the outer diameter OD (mm) of the tire satisfy a relationship 2.135 × SW + 282.3 ≤ OD in the case where the sectional width SW of the tire is 165 (mm) or more, characterised in that the tread rubber has dynamic storage modulus E' at 30 °C of 6.0 MPa to 12.0 MPa, and loss tangent tanδ at 60 °C of 0.05 to 0.15, in at least one of the plurality of land portions, a plurality of sipes are arranged with a predetermined pitch length L (mm) measured along the tire circumferential direction, and a land portion width W (mm) of the land portion, a tire widthwise sipe component total length Ws (mm) of the sipes within one pitch area of the pitch length L (mm) in the land portion, the pitch length L (mm), and a tire circumferential sipe component total length Ls (mm) of the sipes within one pitch area of the pitch length L (mm) in the land portion satisfy relationships 0.4 W ≤ Ws ≤ 1.2 W and 0.6 L ≤ Ls ≤ 3 L, in the land portion in which the sipes are arranged, at least one small hole is provided within one pitch area of the pitch length L (mm), an opening area S (mm 2) of the small hole to the tread surface T is 0.1 ≤ S ≤ 4, and in the land portion in which the sipes are arranged, the pitch length L (mm) and the number N of small holes provided within one pitch area of the pitch length L (mm) satisfy a relationship 0.1 ≤ N / L ≤ 0.3.. a carcass composed of a carcass ply of a radially arranged cord toroidally extending between a pair of bead portions; a tread rubber provided on a tire radial outer side of the carcass; at least two circumferential main grooves continuously extending in a tire circumferential direction in a tread surface; and a plurality of land portions in the tread surface, each of which is defined by adjacent two circumferential main grooves of the at least two circumferential main grooves or by a tire widthwise outermost circumferential main groove of the at least two circumferential main grooves and a tread ground contact edge, wherein when the tire is attached to a rim and set to an internal pressure of 250 kPa or more, a ratio SW/OD between a sectional width SW and an outer diameter OD (mm) of the tire is 0.26 or less in the case where the sectional width SW of the tire is less than 165 (mm), and the sectional width SW and the outer diameter OD (mm) of the tire satisfy a relationship 2.135 × SW + 282.3 ≤ OD in the case where the sectional width SW of the tire is 165 (mm) or more, characterised in that the tread rubber has dynamic storage modulus E' at 30 °C of 6.0 MPa to 12.0 MPa, and loss tangent tanδ at 60 °C of 0.05 to 0.15, in at least one of the plurality of land portions, a plurality of sipes are arranged with a predetermined pitch length L (mm) measured along the tire circumferential direction, and a land portion width W (mm) of the land portion, a tire widthwise sipe component total length Ws (mm) of the sipes within one pitch area of the pitch length L (mm) in the land portion, the pitch length L (mm), and a tire circumferential sipe component total length Ls (mm) of the sipes within one pitch area of the pitch length L (mm) in the land portion satisfy relationships 0.4 W ≤ Ws ≤ 1.2 W and 0.6 L ≤ Ls ≤ 3 L, in the land portion in which the sipes are arranged, at least one small hole is provided within one pitch area of the pitch length L (mm), an opening area S (mm 2) of the small hole to the tread surface T is 0.1 ≤ S ≤ 4, and in the land portion in which the sipes are arranged, the pitch length L (mm) and the number N of small holes provided within one pitch area of the pitch length L (mm) satisfy a relationship 0.1 ≤ N / L ≤ 0.3..