The method of manufacturing the modified conjugated diene rubber

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PROBLEM TO BE SOLVED : To provide a method for producing a conjugated diene rubber used as a raw material for a crosslinked rubber capable of being used for the purpose of a tire tread and the like to enhance low-fuel consumption performance.SOLUTION : The method for producing a modified conjugated diene rubber includes (a) a step of obtaining a modified conjugated diene polymer by reacting a conjugated diene polymer, which has alkali metal or alkaline earth metal active terminals and is obtained by polymerization of a conjugated diene compound or a conjugated diene compound and an aromatic vinyl compound, with a hydrocarbyloxysilane compound having a polysiloxane group of a structure represented by general formula (1) and a group capable of becoming an onium, wherein Rand Rare each independently a monovalent 1-30C hydrocarbon group, and n is an integer of 2-1, 000.