Highly saturated nitrile rubber composition and cross-linked rubber

A highly saturated nitrile rubber composition comprising

• a carboxyl group-containing highly saturated nitrile rubber (A1) containing 15 to 60 wt % of α,β-ethylenically unsaturated nitrile monomer units and 1 to 60 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units and having an iodine value of 120 or less,
• a highly saturated nitrile rubber (A2) containing α,β-ethylenically unsaturated nitrile monomer units in 15 to 60 wt %, having a content of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and having an iodine value of 120 or less, and
• a polyester resin (B),
• wherein the highly saturated nitrile rubber composition contains 7 to 40 wt % of the carboxyl group-containing highly saturated nitrile rubber (A1), 10 to 78 wt % of the highly saturated nitrile rubber (A2), and 15 to 50 wt % of the polyester resin (B) when a total of the carboxyl group-containing highly saturated nitrile rubber (A1), the highly saturated nitrile rubber (A2), and the polyester resin (B) is made 100 wt %, and
• the highly saturated nitrile rubber composition is obtained by mixing the carboxyl group-containing highly saturated nitrile rubber (A1), the highly saturated nitrile rubber (A2), and the polyester resin (B) at a temperature of a melting point of the polyester resin (B) or more.