A pneumatic tire having a tire component prepared by use of a rubber composition comprising: a polybutadiene (i) which satisfies conditions of a Mooney viscosity (ML 1+4, 100°C) of 43 to 70, a ratio (Tcp/ML 1+4, 100°C) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML 1+4, 100°C) of 0.9 to 1.7, a stress relaxation time, being a time until a torque is attenuated by 80% assuming that the torque at the end of ML 1+4, 100°C measurement is 100%, of 10.0 to 40.0 seconds, a molecular weight distribution (Mw/Mn) of 2.50 to 4.00, and a proportion of cis-structure in microstructural analysis of not more than 98 mol%; another rubber (ii); a rubber reinforcing material (iii); wherein the another rubber material (ii) comprises styrene-butadiene rubber; and wherein a Mooney viscosity (ML 1+4, 100°C) of the styrene butadiene rubber is 35 to 75 and/or the styrene content of the styrene-butadiene rubber is not less than 30% by mass, wherein the styrene content is calculated from a 1 H-NMR measurement; wherein the Mooney viscosity (ML 1+4, 100° c) is measured at 100°C in accordance with JIS K 6300, the toluene solution viscosity (Tcp) is measured by using a Cannon-Fenske viscometer No. 400 at 25°C after dissolving 2.28 g of polymer in 50 ml of toluene with a standard liquid of JIS Z 8809 for calibrating viscometers is used as a standard solution, the stress relaxation time is calculated by a stress relaxation measurement according to ASTM D 1646-7. a polybutadiene (i) which satisfies conditions of a Mooney viscosity (ML 1+4, 100°C) of 43 to 70, a ratio (Tcp/ML 1+4, 100°C) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML 1+4, 100°C) of 0.9 to 1.7, a stress relaxation time, being a time until a torque is attenuated by 80% assuming that the torque at the end of ML 1+4, 100°C measurement is 100%, of 10.0 to 40.0 seconds, a molecular weight distribution (Mw/Mn) of 2.50 to 4.00, and a proportion of cis-structure in microstructural analysis of not more than 98 mol%; a Mooney viscosity (ML 1+4, 100°C) of 43 to 70, a ratio (Tcp/ML 1+4, 100°C) of 5% by mass toluene solution viscosity (Tcp) to Mooney viscosity (ML 1+4, 100°C) of 0.9 to 1.7, a stress relaxation time, being a time until a torque is attenuated by 80% assuming that the torque at the end of ML 1+4, 100°C measurement is 100%, of 10.0 to 40.0 seconds, a molecular weight distribution (Mw/Mn) of 2.50 to 4.00, and a proportion of cis-structure in microstructural analysis of not more than 98 mol%; another rubber (ii); a rubber reinforcing material (iii); wherein the another rubber material (ii) comprises styrene-butadiene rubber; and wherein a Mooney viscosity (ML 1+4, 100°C) of the styrene butadiene rubber is 35 to 75 and/or the styrene content of the styrene-butadiene rubber is not less than 30% by mass, wherein the styrene content is calculated from a 1 H-NMR measurement; wherein the Mooney viscosity (ML 1+4, 100° c) is measured at 100°C in accordance with JIS K 6300, the toluene solution viscosity (Tcp) is measured by using a Cannon-Fenske viscometer No. 400 at 25°C after dissolving 2.28 g of polymer in 50 ml of toluene with a standard liquid of JIS Z 8809 for calibrating viscometers is used as a standard solution, the stress relaxation time is calculated by a stress relaxation measurement according to ASTM D 1646-7.