There is provided an electrodeposition method light modulating device including: (1) a transparent electrode, to which a polymer having a metallocene at a side chain thereof is fixed by a chemical bond; (2) a transparent electrode that is disposed to face the transparent electrode (1), and forms metal through a reducing reaction of metal ions thereon; and (3) an electrolytic solution containing the metal ions, which can be reduced by applying current thereto, and disposed between the transparent electrode (1) and the transparent electrode (2). In an electrodeposition method reflective display device, the electrolytic solution is held by a gelatinous polymer, and the white pigment is dispersed in the gelatinous polymer.