Resin joined body production device and resin joined body production method

Provided are a resin joined body production device and a resin joined body production method which enable production of a resin joined body exhibiting a strong joining force without using an adhesive while preventing deterioration in optical characteristics and mechanical strength of resin members. This resin joined body production device produces a resin joined body by joining two or more resin members, and is provided with a surface treatment mechanism and a joining mechanism. The surface treatment mechanism has an electrode unit for generating plasma, and a member holding mechanism which is disposed with a gap from the electrode unit and which holds the resin members. By means of plasma generated by the electrode unit, to-be-joined surfaces of the resin members held by the member holding mechanism are activated. The joining mechanism causes two or more resin members, in which at least one of the opposing to-be-joined surfaces is activated by the surface treatment mechanism, to be attached together at the t