PROBLEM TO BE SOLVED: To provide a display device capable of changing a structural color into multiple colors.SOLUTION: A display device 10 includes: a display electrode 13 through which at least the rays of light of a visible light region are transmitted; a back electrode 14 arranged so as to be opposite to a display substrate with an interval; colloidal crystal solution 15 interposed between the respective electrodes; and a voltage application device 20 for applying a voltage via the respective electrodes 13 and 14 to the colloidal crystal solution. The colloidal crystal solution 15 has a colloidal crystal structure formed by periodically arraying many colloidal particles 15b that are dispersoids with predetermined intervals in a liquid dispersive medium 15a. Fine particles 15c whose primary particle diameters are smaller than those of the colloidal particles 15b are added and dispersed in the dispersive medium 15a.
