To provide a transition metal complex.

The transition metal complex is represented by formula (1-1) or formula (1-2) (wherein M is a transition metal atom of group 8-10; X is an oxygen atom or sulfur atom; Y is a carbon atom or nitrogen atom; L is a neutral or anionic ligand; m is an integer of 1-3; n is an integer of 0-3; R1-R8 are each a hydrogen atom, a fluorine atom, a 1-10C hydrocarbon, a 1-10C alkyloxy, a 6-10C aryloxy, a hydrocarbon-substituted silyl or methylsilyl represented by formula (2): CH2SiRaRbRc (at least one of substituents represented by R1-R8 is methylsilyl represented by formula (2))).