Rubber composition and tire obtained using same

A rubber composition comprising a rubber component that contains a diene rubber, wherein the diene rubber contains a polymer (A) of a copolymer that has, in one molecule, a block moiety containing a urethane backbone segment and a block moiety containing a diene backbone segment, wherein the urethane backbone segment in the polymer (A) has a structure represented by the following formula 1:

• wherein A represents any one of formulas 4 to 7, and n represents 10 to 500,
• wherein in formula 4, P is a bonding point that bonds to a nitrogen atom adjacent to A via a single bond, D is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and plural D's may be the same as or different from one another,
• wherein in formula 5, P is a bonding point that bonds to a nitrogen atom adjacent to A via a single bond, E is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and plural E's may be the same as or different from each other,
• wherein in formula 6, P is a bonding point that bonds to a nitrogen atom adjacent to A via a single bond, and
• wherein in formula 7, n is 1 to 32, P is a bonding point that bonds to a nitrogen atom adjacent to A via a single bond, F is a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, and plural F's may be the same as or different from each other.