A method of production of a conjugated diene rubber comprising a step of polymerizing isoprene or a monomer mixture containing isoprene and an aromatic vinyl monomer in an inert solvent by using a polymerization initiator so as to form a polymer block having an active end and containing 80 to 100 wt% of isoprene monomer units and 0 to 20 wt% of aromatic vinyl monomer units, a step of mixing the polymer block having an active end and 1,3-butadiene or a monomer mixture containing 1,3-butadiene and an aromatic vinyl monomer to continue a polymerization reaction and forming a polymer block having an active end and containing 50 to 100 wt% of 1,3-butadiene monomer units and 0 to 50 wt% of aromatic vinyl monomer units as a continuation of the polymer block so as to obtain a conjugated diene polymer chain having an active end, and a step of reacting a compound represented by the following general formula with the active end of the conjugated diene polymer chain having an active end: wherein, in the general formula, X 1 represents a functional group selected from a hydrocarbyloxy group, halogen group, and hydroxyl group, R 1 represents a substituted or unsubstituted hydrocarbon group, each of R 2 and R 3 independently represents a substituted or unsubstituted hydrocarbon group, R 2 and R 3 may bond with each other to form a ring structure together with the nitrogen atom represented by "N" in the general formula, and, when forming the ring structure, R 2 and R 3 may form a ring structure together with a hetero atom other than the nitrogen atom represented by the "N" in addition to the nitrogen atom represented by the "N", "r" is an integer of 0 to 2. a step of polymerizing isoprene or a monomer mixture containing isoprene and an aromatic vinyl monomer in an inert solvent by using a polymerization initiator so as to form a polymer block having an active end and containing 80 to 100 wt% of isoprene monomer units and 0 to 20 wt% of aromatic vinyl monomer units, a step of mixing the polymer block having an active end and 1,3-butadiene or a monomer mixture containing 1,3-butadiene and an aromatic vinyl monomer to continue a polymerization reaction and forming a polymer block having an active end and containing 50 to 100 wt% of 1,3-butadiene monomer units and 0 to 50 wt% of aromatic vinyl monomer units as a continuation of the polymer block so as to obtain a conjugated diene polymer chain having an active end, and a step of reacting a compound represented by the following general formula with the active end of the conjugated diene polymer chain having an active end: wherein, in the general formula, X 1 represents a functional group selected from a hydrocarbyloxy group, halogen group, and hydroxyl group, R 1 represents a substituted or unsubstituted hydrocarbon group, each of R 2 and R 3 independently represents a substituted or unsubstituted hydrocarbon group, R 2 and R 3 may bond with each other to form a ring structure together with the nitrogen atom represented by "N" in the general formula, and, when forming the ring structure, R 2 and R 3 may form a ring structure together with a hetero atom other than the nitrogen atom represented by the "N" in addition to the nitrogen atom represented by the "N", "r" is an integer of 0 to 2.