The present invention provides a process for producing a conjugated diene polymer, the process including a production step of producing a conjugated diene polymer solution containing a conjugated diene polymer and a solvent, and a devolatilization step of heating the conjugated diene polymer solution while conveying the conjugated diene polymer solution with an apparatus having rotary twin screws, thereby devolatilizing the solvent, in which a motor current value of the screw in the devolatilization step and a motor current value of the screw under no load satisfy a predetermined relational expression.