A pneumatic tire, comprising: a tread portion extending in a tire circumferential direction (Tc) and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion ; and a pair of bead portions disposed inward of the pair of sidewall portions in a tire radial direction, wherein a carcass layer is mounted between the pair of bead portions , the tread portion has a multilayer structure including a cap tread rubber layer and an undertread rubber layer , grooves and sipes are formed in the tread portion , a snow traction index STI is set to 180 or more, wherein the snow traction index STI is calculated as follows: STI = − 6.8 + 2202 ρ g + 672 ρ s + 7.6 Dg wherein ρg is a ratio between a total length of extending components of the grooves in the tire lateral direction in mm and a total area of a ground contact region in mm 2 , ρs is a ratio between a total length of extending components of the sipes in the tire lateral direction in mm and a total area of a ground contact region in mm 2 , and Dg: is the average groove depth in mm, a tread radius (TR) in a meridian cross-section of the tread portion falls within a range of from 80% to 140% of a tire outer diameter (OD), a ground contact width (TCW) of the tread portion falls within a range of from 70% to 75% of a tire cross-sectional width (SW), and a height (BFH) of a bead filler disposed on an outer circumference of a bead core of each of the pair of bead portions is 40% or less of a tire cross-sectional height (SH). a tread portion extending in a tire circumferential direction (Tc) and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion ; and a pair of bead portions disposed inward of the pair of sidewall portions in a tire radial direction, wherein a carcass layer is mounted between the pair of bead portions , the tread portion has a multilayer structure including a cap tread rubber layer and an undertread rubber layer , grooves and sipes are formed in the tread portion , a snow traction index STI is set to 180 or more, wherein the snow traction index STI is calculated as follows: STI = − 6.8 + 2202 ρ g + 672 ρ s + 7.6 Dg wherein ρg is a ratio between a total length of extending components of the grooves in the tire lateral direction in mm and a total area of a ground contact region in mm 2 , ρs is a ratio between a total length of extending components of the sipes in the tire lateral direction in mm and a total area of a ground contact region in mm 2 , and Dg: is the average groove depth in mm, ρg is a ratio between a total length of extending components of the grooves in the tire lateral direction in mm and a total area of a ground contact region in mm 2 , ρs is a ratio between a total length of extending components of the sipes in the tire lateral direction in mm and a total area of a ground contact region in mm 2 , and Dg: is the average groove depth in mm, a tread radius (TR) in a meridian cross-section of the tread portion falls within a range of from 80% to 140% of a tire outer diameter (OD), a ground contact width (TCW) of the tread portion falls within a range of from 70% to 75% of a tire cross-sectional width (SW), and a height (BFH) of a bead filler disposed on an outer circumference of a bead core of each of the pair of bead portions is 40% or less of a tire cross-sectional height (SH). <EOS>