An electrochromic dimming device, comprising: an electrochromic element; a color development power source to supply electric power to the electrochromic element when the electrochromic element develops color; a color discharge power source to supply electric power to the electrochromic element when the electrochromic element discharges color; and characterized in that the device further comprises a variable resistance disposed on a first current path without being disposed on a second current path, the first current path formed from the color development power source through a ground via the electrochromic element and the variable resistance, and the second current path formed from the color discharge power source to the ground via the electrochromic element; a series circuit including a first switch and the variable resistance, the series circuit being connected to the color development power source and a first end of the electrochromic element, the first switch to be turned on or off when the electrochromic element develops color or discharges color, respectively; a fourth switch connected to a second end of the electrochromic element and the ground, the fourth switch to be turned on or off when the electrochromic element develops color or discharges color, respectively; a third switch connected to the color discharge power source and the second end of the electrochromic element, the third switch to be turned off or on when the electrochromic element develops color or discharges color, respectively; and a second switch connected to the first end of the electrochromic element and the ground, the second switch to be turned off or on when the electrochromic element develops color or discharges color, respectively, wherein the first current path is formed when the first switch and the fourth switch are tuned on, and wherein the second current path is formed when the third switch and the second switch are tuned on. an electrochromic element; a color development power source to supply electric power to the electrochromic element when the electrochromic element develops color; a color discharge power source to supply electric power to the electrochromic element when the electrochromic element discharges color; and characterized in that the device further comprises a variable resistance disposed on a first current path without being disposed on a second current path, the first current path formed from the color development power source through a ground via the electrochromic element and the variable resistance, and the second current path formed from the color discharge power source to the ground via the electrochromic element; a series circuit including a first switch and the variable resistance, the series circuit being connected to the color development power source and a first end of the electrochromic element, the first switch to be turned on or off when the electrochromic element develops color or discharges color, respectively; a fourth switch connected to a second end of the electrochromic element and the ground, the fourth switch to be turned on or off when the electrochromic element develops color or discharges color, respectively; a third switch connected to the color discharge power source and the second end of the electrochromic element, the third switch to be turned off or on when the electrochromic element develops color or discharges color, respectively; and a second switch connected to the first end of the electrochromic element and the ground, the second switch to be turned off or on when the electrochromic element develops color or discharges color, respectively, wherein the first current path is formed when the first switch and the fourth switch are tuned on, and wherein the second current path is formed when the third switch and the second switch are tuned on.