An image display apparatus 120 for imaging and displaying a test substance contained in a sample 111 includes an imaging unit 200 for imaging a test substance, an image processing unit 121 for generating an image 61 for display including an additional image 11c in which the pixel value of each pixel is set in uneven distribution added to at least part of the captured image 11 obtained by the imaging unit 200 and a region 21 of the test substance, and a display unit 123 for displaying the image 61 generated by the image processing unit 121.
