A cork stopper used for sealing a container opening and a production method for the cork stopper. The cork stopper comprises a cork stopper body having a molded cork body and a synthetic resin outer layer covering an outer circumference of the molded cork body, the synthetic resin outer layer being made of a synthetic material treated with a roughening process on its surface. The cork stopper body is set to a freely rotatable jig and is rotated together with a transcribing mold with a concave-convex surface by pressing the transcribing mold onto the outer circumference of the cork stopper body while rotating the transcribing mold, thereby transcribing the concave-convex onto the surface of the synthetic resin outer layer.