Abstract: An insulator including an insulator body, a metal fitting secured to the insulator body via cement material, a conductive layer provided on the insulator body, the conductive layer including a first exposed portion and a second portion embedded in the cement material, and a conductive covering film provided on the second portion of the conductive layer. A conductive grain layer is on the second portion of the conductive layer and is covered by the conductive covering film. According to the present invention, the conductive covering film is more flexible than the second portion of the conductive layer. The present insulator has a simple construction, is easy to produce, and assures continued electrical conduction through the cement material over time.