Polymerization catalyst composition, and production of conjugated diene polymer

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Provided is a polymerization catalyst composition capable of producing a conjugated diene polymer having a high cis-1, 4 bond content or a conjugated diene-based copolymer having a high 1, 4 bond content. The polymerization catalyst composition comprises : a Component (A) being a rare earth element compound represented by the following general formula (a-1) : M-(AQ 1 )(AQ 2 )(AQ 3 ), where M is selected from scandium, yttrium or lanthanoid elements; AQ 1 , AQ 2 and AQ 3 are the same or different functional groups; A is nitrogen, oxygen or sulfur; and the Component (A) has at least one M-A bond; a Component (B) being an ionic compound; and a Component (C) being a compound containing a cyclopentadiene skeleton selected from substituted or unsubstituted cyclopentadienes, substituted or unsubstituted indenes, or substituted or unsubstituted fluorenes.