POLYMERIZATION CATALYST COMPOSITION, METHOD FOR PRODUCING SYNTHETIC POLYISOPRENE, AND SYNTHETIC PO

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Provided is a polymerization catalyst composition that makes it possible to efficiently synthesize a polyisoprene having a high molecular weight under industrial conditions without the occurrence of excessive gelling. The polymerization catalyst composition is characterized by comprising : a rare earth element compound (component (A)) that is represented by formula (i) (Formula (i) : M-(NQ1)(NQ2)(NQ3). In the formula, M represents at least one element selected from among lanthanoids, scandium, and yttrium. NQ1, NQ2, and NQ3 each represent an amide group and may be the same or different, but have an M-N bond.); a hydrocarbyl aluminoxane compound (component (B)) that comprises a hydrocarbon group having a carbon number of 1-20; and a compound (component (C)) that is represented by formula (X) (Formula (X) : YR1aR2bR3c. In the formula, Y is a metal selected from among group 1, group 2, group 12, and group 13 elements of the period table, R1 and R2 are each a hydrocarbon group having a carbon number of 1-10 or a hydrogen atom, and R3 is a hydrocarbon group having a carbon number of 1-10. R1, R2, and R3 may be the same as or different from each other. When Y is a metal that is selected from among group 1 elements of the periodic table, a is 1 and b and c are 0. When Y is a metal that is selected from among group 2 and group 12 elements of the periodic table, a and b are 1 and c is 0. When Y is a metal that is selected from among group 13 elements of the periodic table, a, b, and c are 1.).