A reflective display device comprising: first and second substrates (105, 405) facing each other, each of which includes a display area and a reflective area; a display element provided in the display area; and a reflective control element provided in the reflective area, configured to control reflectance of externally incident light such that when the display element is driven to display an image, the reflective control element is driven to absorb externally incident light, characterized in that the reflective control element is further configured to control reflectance of externally incident light such that when the display element is not driven so as not to display an image, the reflective control element is driven to reflect externally incident light without absorbing the light such that the reflective display device is used as a mirror that reflects an object when an image is not displayed the reflective display device being further characterized in that the reflective control element includes: a reflective electrode on one surface of the first substrate to face the second substrate; a transparent electrode arranged on one surface of the second substrate to face the first substrate; an electrochromic layer provided on the reflective electrode; and an electrolytic layer arranged between the electrochromic layer and the transparent electrode, and in that the reflective display device further comprises a barrier provided between the first substrate and the second substrate portioning the reflective area and the display area from each other. first and second substrates (105, 405) facing each other, each of which includes a display area and a reflective area; a display element provided in the display area; and a reflective control element provided in the reflective area, configured to control reflectance of externally incident light such that when the display element is driven to display an image, the reflective control element is driven to absorb externally incident light, characterized in that the reflective control element is further configured to control reflectance of externally incident light such that when the display element is not driven so as not to display an image, the reflective control element is driven to reflect externally incident light without absorbing the light such that the reflective display device is used as a mirror that reflects an object when an image is not displayed the reflective display device being further characterized in that the reflective control element includes: a reflective electrode on one surface of the first substrate to face the second substrate; a transparent electrode arranged on one surface of the second substrate to face the first substrate; an electrochromic layer provided on the reflective electrode; and an electrolytic layer arranged between the electrochromic layer and the transparent electrode, and in that the reflective display device further comprises a barrier provided between the first substrate and the second substrate portioning the reflective area and the display area from each other. a reflective electrode on one surface of the first substrate to face the second substrate; a transparent electrode arranged on one surface of the second substrate to face the first substrate; an electrochromic layer provided on the reflective electrode; and an electrolytic layer arranged between the electrochromic layer and the transparent electrode, and in that the reflective display device further comprises a barrier provided between the first substrate and the second substrate portioning the reflective area and the display area from each other.