A pneumatic tire and tire rubber composition

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PROBLEM TO BE SOLVED : To provide a rubber composition for a tire of which low fuel cost, rubber strength, abrasion resistance, wet grip performance and workability are improved in a good balance, and to provide a pneumatic tire using the same.SOLUTION : The invention relates to a rubber composition for a tire containing a rubber constituent, silica, a silane coupling agent containing a mercapto group, and a polysulfide compound represented by the formula (I) and/or (II). In the formulas (I), (II), Rand Rare same or different and represent bivalent hydrocarbon group having 3 to 15 carbon atoms which may have a substituent and m represents an integer of 2 to 6.