| abstract |
[PROBLEMS] To provide a conjugated diene polymer capable of obtaining a polymer composition excellent in fuel efficiency, a polymer composition comprising the conjugated diene polymer and a filler, and the conjugated diene polymer. A manufacturing method is provided. A conjugated diene polymer having a conjugated diene unit and a structural unit represented by formula (I), wherein at least one end of the polymer is modified with a silicon compound. [X 1 to X 3 represent a group represented by formula (Ia), a hydroxyl group, and a (substituted) hydrocarbyl group, and at least one of X 1 to X 3 represents a group or hydroxyl group represented by formula (Ia)] [Selection figure] None |