Latex of the highly saturated nitrile rubber and adhesive composition

An adhesive composition comprising a latex of a highly saturated nitrile rubber,

• wherein the highly saturated nitrile rubber contains α,β-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and diene monomer units in a ratio of 40 wt % or more, has an iodine value of 120 or less, and has a weight average molecular weight of solubles in chloroform of 100,000 or less,
• when removing volatiles contained in the latex and making a film of the highly saturated nitrile rubber, a loss tangent tan δ(50° C.) at 50° C. of the film is 0.3 to 0.6 and a complex torque S* at the time of 100% shear strain at 100° C. of the film is 20 dNm or less, and
• the highly saturated nitrile rubber is obtained through a polymerization with a molecular weight modifier added at a middle stage during which a polymerization conversion rate is in a range of 15 to 60 wt % such that the loss tangent tan δ(50° C.) is 0.3 to 0.6 and the complex torque S* is 20 dNm or less.