METHOD FOR MANUFACTURING CONJUGATED DIENE POLYMER WITH MODIFIED END, CONJUGATED DIENE POLYMER WITH

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The purpose of the present invention is to provide : a method for manufacturing a conjugated diene polymer with a modified end capable of achieving very high amounts of cis-1, 4 bonds without requiring complicated manufacturing conditions; a conjugated diene polymer with a modified end obtained using said manufacturing method; a rubber composition comprising said conjugated diene polymer with a modified end; and a tire using said rubber composition. The present invention is a method for manufacturing a conjugated diene polymer with a modified end in which a conjugated diene compound is polymerized using a polymerization catalyst composition and the polymer obtained in said polymerization is modified using a modifying agent, the method being characterized in that : said polymerization catalyst composition comprises a rare earth element compound as well as a coordination compound having a cyclopentadiene backbone selected from substituted or unsubstituted cyclopentadiene, substituted or unsubstituted indene, and substituted or unsubstituted fluorene; and said polymerization and modification are performed in a single pot.