MODIFIED CONJUGATED DIENE RUBBER, METHOD FOR PRODUCING SAME, AND RUBBER COMPOSITION

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Provided is a method for producing a conjugated diene rubber which can be used as a starting material for a crosslinked rubber that is used in applications such as a tire tread and is capable of improving the fuel consumption saving performance. A method for producing a modified conjugated diene rubber, said method comprising (A) a step wherein a modified conjugated diene rubber is obtained by having a conjugated diene compound or a conjugated diene polymer, which is obtained by polymerizing a conjugated diene compound and an aromatic vinyl compound and has an alkali metal active end or an alkaline earth metal active end, react with a first hydrocarbyloxysilane compound that has the following functional groups (a) and (b). Functional group (a) : an alkyl polyether group Functional group (b) : a group capable of forming an onium