An addition-curable liquid silicone rubber composition and a molded silicone-rubber object are provided. The addition-curable liquid silicone rubber composition comprises (A) an alkenylated linear organopolysiloxane which has one silicon-atom-bonded alkenyl group only at each of both molecular-chain terminals and which has an average degree of polymerization of 1,500 or lower and is liquid at 25 DEG C, (B) an alkenylated linear organopolysiloxane which has two or three silicon-atom-bonded alkenyl groups at each of both molecular-chain terminals and which has an average degree of polymerization of 1,500 or lower and is liquid at 25 DEG C, (C) organohydrogenpolysiloxanes comprising (C-1) an organohydrogenpolysiloxane having at least three silicon-atom-bonded hydrogen atoms and (C-2) a linear organohydrogenpolysiloxane blocked with a diorganohydrogensiloxy group at each of both molecular-chain terminals, (D) reinforcing silica obtained by hydrophobizing fumed silica having a BET specific surface area of 130 m2/g or larger, and (E) an addition-reaction catalyst.提供加成硬化性液狀聚矽氧橡膠組成物及聚矽氧橡膠成形體。一種加成硬化性液狀聚矽氧橡膠組成物，其含有(A)僅於分子鏈兩末端含有1個與矽原子鍵結之烯基，且平均聚合度1500以下之於25℃為液狀的含有烯基之直鏈狀有機聚矽氧烷、(B)於分子鏈兩末端含有2~3個之與矽原子鍵結之烯基，且平均聚合度1500以下之於25℃為液狀的含有烯基之直鏈狀有機聚矽氧烷、(C)由(C-1)含有至少3個之鍵結於矽原子之氫原子的有機氫聚矽氧烷，及(C-2)分子鏈兩末端二有機氫矽烷氧基封端直鏈狀有機氫聚矽氧烷所構成之有機氫聚矽氧烷、(D)將BET法比表面積為130m2/g以上之發煙二氧化矽經疏水化處理的補強性二氧化矽、(E)加成反應觸媒。
