A passenger vehicle pneumatic radial tire that achieves improved wet performance and rolling resistance performance in a narrow-width, large-diameter radial tire is provided. 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 SW and OD satisfy a relationship 2.135 × SW + 282.3 ‰¤ OD in the case where SW is 165 (mm) or more. The tread rubber has dynamic storage modulus E' of 6.0 MPa to 12.0 MPa, and loss tangent tan´ of 0.05 to 0.15. In at least one land portion, a plurality of sipes are arranged with a predetermined pitch length L, and a land portion width W, a tire widthwise sipe component total length Ws ‰¤ of the sipes within one pitch area of the pitch length L, the pitch length L, and a tire circumferential sipe component total length Ls of the sipes within one pitch area of the pitch length L satisfy relationships 0.4W ‰¤ Ws ‰¤ 1.2W and 0.6L ‰¤ Ls ‰¤ 3L.