An image analysis apparatus (10) includes: an image input section (11) a region extraction section (12) configured to specify a target element including an annular peripheral portion and a center portion that is surrounded by the peripheral portion and that is in a color different from the peripheral portion in a first image and a second image inputted from the image input section (11), the second image being acquired later than the first image, and configured to extract only the center portion of the target element as a region to be analyzed and a color component extraction section (13) configured to extract respective color component values of the extracted regions to be analyzed of the first and second images.
