RUBBER COMPOSITION FOR TIRE AND TIRE

The purpose of the present invention is to provide: a rubber composition for tires having excellent crack propagation resistance, groove cracking resistance, wear resistance, and chipping resistance; and a tire using the rubber composition for tires. This rubber composition for tires contains a rubber component, silica, and a silane coupling agent, the rubber component having a specific conjugated diene rubber content of 35 mass% or more and a natural rubber content of 10 mass% or more, and the specific conjugated diene rubber is provided with a block A containing an isoprene unit and a block B containing a 1, 3-propylene unit. The present invention relates to a conjugated diene rubber having a block A comprising a 1, 3-butadiene unit, a block B comprising a 1, 3-butadiene unit, and a modified structure comprising a siloxane compound at a terminal, the conjugated diene rubber containing a unit of a vinyl compound containing an amino group in at least one of A and B, the Mw of A being 1,000-30,000, the overall