To prevent the entering of bubbles in a sealing resin layer as well as to eliminate the effect of the open air on an entirely solid electrochromic device by forming a coating film between the protective substrate side surface of the device and the sealing resin layer.

An entirely solid electrochromic device(ECD) 2 is formed on a glass substrate 1 by laminating the members of the ECD 2. This ECD has an iridium hydroxide-base oxidation coloring film, an ionic conductive electrolyte film of tantalum pentoxide and a reduction coloring film of tungsten trioxide held between a pair of transparent substrates. A modified acrylate-base UV- curing adhesive having 2,000cP viscosity is dropped on the surface of the ECD 2, a coating film 3 is formed and the adhesive is cured by irradiation with UV. An adhesive is then dropped on the surface of the glass substrate, a coating film is stuck and a sealing resin layer is formed on the side faces of the ECD as well as on the ECD. The layer is made uniform in thickness and the ECD 2 is sealed.