To improve both rim assemblage performance and anti-rim deviation performance in a pneumatic tire 11.

In turning driving, a large force is generated between a bead part 14 on the outer side of installation and a rim 21, and an inner diameter D1 of a bead core 12 on the outer side of installation is set to be smaller than an inner diameter D2 of a bead core 13 on the inner side of installation, so anti-rim deviation performance at the bead part 14 on the outer side of installation is improved. In the bead core 13 on the inner side of installation with relatively small force, the inner diameter D2 is larger than the inner diameter D1 of the bead core 12 on the outer side of installation, so rim assemblage performance is improved. By thus composing the bead parts to share their roles, both the anti-rim deviation performance and the rim assemblage performance can be improved.