PURPOSE: To raise ultimate strength and improve resistance against wear by making the gross weight of styrene chain of less than five pieces by monotor unit above a particular weight ratio to the whole bound styrene.

CONSTITUTION: A pneumatic tire, containing bound styrene of 10W30wt% and butadiene bound parts 1, 2 of 40W70wt%, further uses for its tread a rubber composition composed of a rubber 100pts.wt. consisting of styrene butadiene copolymer rubber 40W100pts.wt. and diene rubber 0W60pts.wt. of more than one kind different from SBR-A, combined with carbon black 10W120pts.wt. with iodine adsorption quantity of more than 36mg/g as well as dibutylphthalate oil absorption quantity of more than 60ml/100g and vulcanizing agent 0.4W5pts.wt.