A transition metal complex represented by the following Chemical Formula 1: wherein M is a Group 4 transition metal in the periodic table; R 1 is (C1-C20) alkyl; Ar 1 is (C6-C30)aryl, in which the aryl of Ar 1 may be further substituted by one or more substituents selected from the group consisting of (C1-C20)alkyl, halo(C1-C20)alkyl and (C6-C30)aryl(C1-C20)alkyl; R 2 to R 5 are each independently hydrogen, (C1-C20) alkyl, (C1-C20) alkoxy, halo(C1-C20) alkyl, (C3-C20)cycloalkyl, (C1-C20) alkyl (C6-C30) aryl, (C6-C30)aryl, (C6-C30)aryloxy, (C1-C20) alkyl (C6-C30) aryloxy, (C6-C30) aryl (C1-C20) alkyl or ((C1-C20)alkyl(C6-C30)aryl)(C1-C20)alkyl, or R 2 to R 5 are linked with an adjacent substituent to form a fused ring, in which the formed fused ring may be further substituted by one or more substituents selected from the group consisting of (C1-C20)alkyl, (C1-C20)alkoxy, halo(C1-C20)alkyl, (C3-C20)cycloalkyl, (C1-C20)alkyl(C6-C30)aryl, (C6-C30)aryl, (C6-C30)aryloxy, (C1-C20)alkyl(C6-C30)aryloxy, (C6-C30)aryl(C1-C20)alkyl and ((C1-C20)alkyl(C6-C30)aryl) (C1-C20)alkyl; R 9 is (C1-C20) alkyl, (C3-C20) cycloalkyl or (C6-C30)aryl(C1-C20)alkyl; R 6 and R 7 are each independently (C1-C20)alkyl, halo(C1-C20) alkyl, (C3-C20) cycloalkyl, (C6-C30)aryl, (C1-C20)alkyl(C6-C30)aryl, (C1-C20)alkoxy(C6-C30)aryl or (C6-C30)aryl(C1-C20)alkyl, or R 6 and R 7 are linked to each other to form a ring, in which the formed ring may be further substituted by one or more substituents selected from the group consisting of (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C30) aryl (C1-C20) alkyl, (C1-C20)alkoxy, (C3-C20)cycloalkyl, (C6-C20)aryl, (C1-C20) alkyl (C6-C30) aryl and (C6-C20)aryloxy; R 8 is hydrogen or (C1-C20)alkyl; X 1 and X 2 are each independently halogen, (C1-C20)alkyl, (C2-C20)alkenyl, (C3-C20) cycloalkyl, (C6-C30)aryl, (C6-C30) ar (C1-C20) alkyl, ((C1-C20)alkyl(C6-C30)aryl)(C1-C20)alkyl, (C1-C20)alkoxy, (C6-C30)aryloxy, (C1-C20)alkyl(C6-C30)aryloxy, (C1-C20)alkoxy(C6-C30)aryloxy, -OSiR a R b R c, -SR d, -NR e R f, -PR g R h or (C1-C20)alkylidene; R a to R d are each independently (C1-C20) alkyl, (C6-C20)aryl, (C6-C20)ar(C1-C20)alkyl, (C1-C20)alkyl(C6-C20)aryl or (C3-C20)cycloalkyl; and R e to R h are each independently (C1-C20)alkyl, (C6-C20)aryl, (C6-C20)ar(C1-C20)alkyl, (C1-C20)alkyl(C6-C20)aryl, (C3-C20)cycloalkyl, tri(C1-C20)alkylsilyl or tri(C6-C20)arylsilyl; with a proviso that when one of X 1 and X 2 is (C1-C20)alkylidene, the other one is ignored. M is a Group 4 transition metal in the periodic table; R 1 is (C1-C20) alkyl; Ar 1 is (C6-C30)aryl, in which the aryl of Ar 1 may be further substituted by one or more substituents selected from the group consisting of (C1-C20)alkyl, halo(C1-C20)alkyl and (C6-C30)aryl(C1-C20)alkyl; R 2 to R 5 are each independently hydrogen, (C1-C20) alkyl, (C1-C20) alkoxy, halo(C1-C20) alkyl, (C3-C20)cycloalkyl, (C1-C20) alkyl (C6-C30) aryl, (C6-C30)aryl, (C6-C30)aryloxy, (C1-C20) alkyl (C6-C30) aryloxy, (C6-C30) aryl (C1-C20) alkyl or ((C1-C20)alkyl(C6-C30)aryl)(C1-C20)alkyl, or R 2 to R 5 are linked with an adjacent substituent to form a fused ring, in which the formed fused ring may be further substituted by one or more substituents selected from the group consisting of (C1-C20)alkyl, (C1-C20)alkoxy, halo(C1-C20)alkyl, (C3-C20)cycloalkyl, (C1-C20)alkyl(C6-C30)aryl, (C6-C30)aryl, (C6-C30)aryloxy, (C1-C20)alkyl(C6-C30)aryloxy, (C6-C30)aryl(C1-C20)alkyl and ((C1-C20)alkyl(C6-C30)aryl) (C1-C20)alkyl; R 9 is (C1-C20) alkyl, (C3-C20) cycloalkyl or (C6-C30)aryl(C1-C20)alkyl; R 6 and R 7 are each independently (C1-C20)alkyl, halo(C1-C20) alkyl, (C3-C20) cycloalkyl, (C6-C30)aryl, (C1-C20)alkyl(C6-C30)aryl, (C1-C20)alkoxy(C6-C30)aryl or (C6-C30)aryl(C1-C20)alkyl, or R 6 and R 7 are linked to each other to form a ring, in which the formed ring may be further substituted by one or more substituents selected from the group consisting of (C1-C20)alkyl, halo(C1-C20)alkyl, (C6-C30) aryl (C1-C20) alkyl, (C1-C20)alkoxy, (C3-C20)cycloalkyl, (C6-C20)aryl, (C1-C20) alkyl (C6-C30) aryl and (C6-C20)aryloxy; R 8 is hydrogen or (C1-C20)alkyl; X 1 and X 2 are each independently halogen, (C1-C20)alkyl, (C2-C20)alkenyl, (C3-C20) cycloalkyl, (C6-C30)aryl, (C6-C30) ar (C1-C20) alkyl, ((C1-C20)alkyl(C6-C30)aryl)(C1-C20)alkyl, (C1-C20)alkoxy, (C6-C30)aryloxy, (C1-C20)alkyl(C6-C30)aryloxy, (C1-C20)alkoxy(C6-C30)aryloxy, -OSiR a R b R c, -SR d, -NR e R f, -PR g R h or (C1-C20)alkylidene; R a to R d are each independently (C1-C20) alkyl, (C6-C20)aryl, (C6-C20)ar(C1-C20)alkyl, (C1-C20)alkyl(C6-C20)aryl or (C3-C20)cycloalkyl; and R e to R h are each independently (C1-C20)alkyl, (C6-C20)aryl, (C6-C20)ar(C1-C20)alkyl, (C1-C20)alkyl(C6-C20)aryl, (C3-C20)cycloalkyl, tri(C1-C20)alkylsilyl or tri(C6-C20)arylsilyl; with a proviso that when one of X 1 and X 2 is (C1-C20)alkylidene, the other one is ignored.