A transition metal compound represented by Formula 1 below: wherein, in Formula 1, M is a Group 4 transition metal; R1, R2, R3 and R4 are each independently hydrogen; (C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20)alkenyl including or not including acetal, ketal or an ether group; (C 6 -C 20)aryl including or not including acetal, ketal or an ether group; (C 1 -C 20)alkyl(C 6 -C 20)aryl including or not including acetal, ketal or an ether group; (C 6 -C 20)aryl(C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; or (C 1 -C 20) silyl including or not including acetal, ketal or an ether group; and two or more among R1, R2, R3, and R4 are able to be connected with each other to form an aliphatic ring or an aromatic ring; R5, R6, R7 and R8 are each independently hydrogen; (C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20)alkenyl including or not including acetal, ketal or an ether group; (C 1 -C 20)alkyl(C 6 -C 20)aryl including or not including acetal, ketal or an ether group; R9, R10, R11, R12, R13, R14, R15 and R16 are each independently hydrogen; (C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20)alkenyl including or not including acetal, ketal or an ether group; (C 1 -C 20)alkyl(C 6 -C 20)aryl including or not including acetal, ketal or an ether group; (C 6 -C 20)aryl(C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; or (C 1 -C 20)silyl including or not including acetal, ketal or an ether group; and two or more among R9, R10, R11, R12, R13, R14, R15 and R16 are able to be connected with each other to form an aliphatic ring or an aromatic ring; R17 and R18 are each independently hydrogen, (C 1 -C 20)alkyl, (C 2 -C 20)alkenyl, (C 2 -C 20)alkynyl, (C 6 -C 20)aryl, (C 1 -C 20)alkyl(C 6 -C 20)aryl, (C 6 -C 20)aryl(C 1 -C 20)alkyl, (C 1 -C 20)alkylamido, (C 6 -C 20)arylamido, or (C 1 -C 20)alkylidene; and n is an integer of 1 or 2. wherein, in Formula 1, M is a Group 4 transition metal; R1, R2, R3 and R4 are each independently hydrogen; (C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20)alkenyl including or not including acetal, ketal or an ether group; (C 6 -C 20)aryl including or not including acetal, ketal or an ether group; (C 1 -C 20)alkyl(C 6 -C 20)aryl including or not including acetal, ketal or an ether group; (C 6 -C 20)aryl(C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; or (C 1 -C 20) silyl including or not including acetal, ketal or an ether group; and two or more among R1, R2, R3, and R4 are able to be connected with each other to form an aliphatic ring or an aromatic ring; R5, R6, R7 and R8 are each independently hydrogen; (C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20)alkenyl including or not including acetal, ketal or an ether group; (C 1 -C 20)alkyl(C 6 -C 20)aryl including or not including acetal, ketal or an ether group; R9, R10, R11, R12, R13, R14, R15 and R16 are each independently hydrogen; (C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; (C 2 -C 20)alkenyl including or not including acetal, ketal or an ether group; (C 1 -C 20)alkyl(C 6 -C 20)aryl including or not including acetal, ketal or an ether group; (C 6 -C 20)aryl(C 1 -C 20)alkyl including or not including acetal, ketal or an ether group; or (C 1 -C 20)silyl including or not including acetal, ketal or an ether group; and two or more among R9, R10, R11, R12, R13, R14, R15 and R16 are able to be connected with each other to form an aliphatic ring or an aromatic ring; R17 and R18 are each independently hydrogen, (C 1 -C 20)alkyl, (C 2 -C 20)alkenyl, (C 2 -C 20)alkynyl, (C 6 -C 20)aryl, (C 1 -C 20)alkyl(C 6 -C 20)aryl, (C 6 -C 20)aryl(C 1 -C 20)alkyl, (C 1 -C 20)alkylamido, (C 6 -C 20)arylamido, or (C 1 -C 20)alkylidene; and n is an integer of 1 or 2.