4789A method for producing a modified conjugated diene polymer comprising: a polymerization step of producing a conjugated diene polymer having an active terminal using a polymerization initiator that comprises a compound having at least one nitrogen atom in the molecule and an organic lithium compound; and a modification step of reacting the active terminal of the conjugated diene polymer with a modifying agent represented by chemical formula (6). (In formula (6) R to R independently represent an alkyl group having 1 to 20 carbon atoms or an aryl group having 6 to 20 carbon atoms; R represents an alkylene group having 3 to 10 carbon atoms; R represents an alkylene group having 1 to 20 carbon atoms; m represents an integer of 1 or 2; and n represents an integer of 2 or 3.)
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