To optimize fitting pressure or fastening force of a bead.

This tubeless tire includes an annular bead core 3 at a bead, and a bead core cross-sectional ratio Cw/Ch being the ratio of a width Cw and height Ch of the bead core 3 is from 0.33 to 2.5 at a tire meridional cross section including a tire axis. In such a case, equations: 1.003≤Φ/D≤1.020, 5°≤θ≤25°, 0.45≤L/W≤0.60 are satisfied. In the equations, Φ stands for an inner diameter of the bead core 3; D for a rim diameter of a normal rim; θ for an angle of a bead bottom surface in regard to a tire axial line; W for a bead width; and L for a tire axial distance from the bead bottom surface to a cross- sectional center point of the bead core 3.