A conjugated diene polymer represented by the following formula (1) or the following formula (2): (wherein, in the formula (1) and in the formula (2), the “polymer” represents a polymer chain containing conjugated diene monomer units, X1 and X2 represent a functional group selected from a hydrocarbyloxy group, halogen group, and hydroxyl group, R1 and R4 represent a substituted or unsubstituted hydrocarbon group, R2 and R3 and R5 and R6 respectively represent a substituted or unsubstituted hydrocarbon group, R2 and R3 or R5 and R6 may bond with each other to form a ring structure. In the formula (1), “n” is an integer of 1 to 3, “m” is an integer of 0 to 2, “p” is an integer of 0 to 2, and n+m+p=3. Further, in the formula (2), “s” is 1 or 2, “t” is 0 or 1, “u” is 0 or 1, and s+t+u=2).