A color perception tester, comprising: a color matching processor that is adapted to execute a color matching processing on a color monitor; an image display controller that is adapted to execute at least two display steps (S1, S2): a first display step wherein two or more images for color perception test are displayed in order on said color monitor on which said color matching processing was done, and a second display step wherein two or more images for color perception test are displayed in order on said color monitor; and; whereby said image display controller is configured to change any of six elements when displaying each image for color perception test in each display step (S1, S2), at the first display step, said image display controller is adapted to change one element as a first element among the six elements and fix the rest five elements, wherein the six elements are: hue for color perception test, brightness for color perception test, saturation for color perception test, display time for color perception test, brightness of a background if the image for color perception test is comprised of the background image and the stimulus shown in the background image, brightness of a stimulus if the image for color perception test is comprised of the background image and the stimulus shown in the background image; said image display controller is adapted to change in said second display step one element as a second element, which is one element among the group of six elements to excluding said first element; and said image display controller is adapted to fix four elements excluding said first element and said second element during said second display step; if said image display controller is adapted to change the element as the first element or the second element, said image display controller is adapted to change the display time of each image for color perception test so as to become longer than the display time of the first image. a color matching processor that is adapted to execute a color matching processing on a color monitor; an image display controller that is adapted to execute at least two display steps (S1, S2): a first display step wherein two or more images for color perception test are displayed in order on said color monitor on which said color matching processing was done, and a second display step wherein two or more images for color perception test are displayed in order on said color monitor; and; whereby said image display controller is configured to change any of six elements when displaying each image for color perception test in each display step (S1, S2), at the first display step, said image display controller is adapted to change one element as a first element among the six elements and fix the rest five elements, wherein the six elements are: hue for color perception test, brightness for color perception test, saturation for color perception test, display time for color perception test, brightness of a background if the image for color perception test is comprised of the background image and the stimulus shown in the background image, brightness of a stimulus if the image for color perception test is comprised of the background image and the stimulus shown in the background image; hue for color perception test, brightness for color perception test, saturation for color perception test, display time for color perception test, brightness of a background if the image for color perception test is comprised of the background image and the stimulus shown in the background image, brightness of a stimulus if the image for color perception test is comprised of the background image and the stimulus shown in the background image; said image display controller is adapted to change in said second display step one element as a second element, which is one element among the group of six elements to excluding said first element; and said image display controller is adapted to fix four elements excluding said first element and said second element during said second display step; if said image display controller is adapted to change the element as the first element or the second element, said image display controller is adapted to change the display time of each image for color perception test so as to become longer than the display time of the first image.