Electrochromic device

An electrochromic layer (10) consisting of an electrochromic material film (22) and an electrolyte (28) is provided between transparent electrode films (20, 24) of two glass substrates (12, 14). An ultraviolet radiation stabilizing agent is not added to the electrolyte (28). A photocatalytic layer (16) and a porous inorganic hydrophilic layer (18) are formed on the front surface side of the front side glass substrate (12) to make the surface of the device hydrophilic. The photocatalytic layer (16) is excited by irradiation of ultraviolet radiation and decomposes dirt deposited on the surface of the porous inorganic hydrophilic layer (18), thereby maintaining the hydrophilic property. Since the photocatalytic layer (16) absorbs ultraviolet radiation, occurrence of a photochromism in the electrochromic material film (22) can be prevented.