An electrochromic display device comprising: a first substrate; a first electrode provided in an upper surface of the first substrate; a second substrate formed by a transparent material, the second substrate being provided above the first substrate to be opposed to the first substrate; a second electrode provided in a lower surface of the second substrate, at least a part of the second electrode being formed by a transparent electrode material; and an electrochromic composition layer provided in between the first substrate and the second substrate, wherein the electrochromic display device is configured to be driven by a passive matrix drive in which the electrochromic display device is configured to perform a display by an energization between the first electrode and the second electrode, and is configured to perform an erasion of the display by an energization in a direction reverse to a direction of the energization between the first electrode and the second electrode for the display, wherein the first electrode comprises a plurality of electrodes which extend parallely, wherein the second electrode comprises a plurality of transparent display electrodes which extend parallely in a direction perpendicular to an extending direction of the first electrode, wherein a pixel is formed in each region where the first electrode and the second electrode are in a grade separated crossing, that is, where the first electrode crosses with the second electrode with an interval, characterized in that the electrochromic display device is configured such that, when the display is performed, a first voltage application processing is performed for each selection pixel, which is a pixel to be colored, in which: (i) the first electrode forming the selection pixel is set as a negative electrode, and the second electrode forming the selection pixel is set as a positive electrode, to apply a voltage of a first potential difference in between the first electrode and the second electrode, immediately followed by (ii) the first electrode being set as the positive electrode, and the second electrode being set as the negative electrode, to apply a voltage of a second potential difference which is equal to or more than the first potential difference in between the first electrode and the second electrode, wherein the electrochromic display device is configured such that a ratio of the voltage of the first potential difference to the voltage of the second potential difference ranges from 1:1 to 1:1.5, and a ratio of an application time of the voltage of the first potential difference to an application time of the voltage of the second potential difference ranges from 1:0.25 to 1:0.5, so that the display is still performed even after the voltage of the second potential difference has been applied. a first substrate; a first electrode provided in an upper surface of the first substrate; a second substrate formed by a transparent material, the second substrate being provided above the first substrate to be opposed to the first substrate; a second electrode provided in a lower surface of the second substrate, at least a part of the second electrode being formed by a transparent electrode material; and an electrochromic composition layer provided in between the first substrate and the second substrate, wherein the electrochromic display device is configured to be driven by a passive matrix drive in which the electrochromic display device is configured to perform a display by an energization between the first electrode and the second electrode, and is configured to perform an erasion of the display by an energization in a direction reverse to a direction of the energization between the first electrode and the second electrode for the display, wherein the first electrode comprises a plurality of electrodes which extend parallely, wherein the second electrode comprises a plurality of transparent display electrodes which extend parallely in a direction perpendicular to an extending direction of the first electrode, wherein a pixel is formed in each region where the first electrode and the second electrode are in a grade separated crossing, that is, where the first electrode crosses with the second electrode with an interval,