RUBBER COMPOSITION, CROSSLINKED BODY AND TIRE

Provided is a rubber composition containing: (A) a polymer which has a carbon-carbon unsaturated bond and in which a value α represented by the following equation (i) is 0.70 or more and 0.99 or less when p, q, r, and s are defined as constituent proportions (molar proportions), in the polymer, of a structural unit represented by the following formula (1), a structural unit represented by the following formula (2), a structural unit represented by the following formula (3), and a structural unit represented by the following formula (4), respectively; and (B) a thermoplastic resin, in which the polymer (A) is contained in an amount of 60% to 95% by mass relative to the total amount of the polymer (A) and the resin (B), α= p + 0.5 × r / p + q + 0.5 × r + s ―CH―CH― (3) ―CH―CH=CH―CH― (4)