To reduce a use amount of paper in printing plate check while allowing the printing plate check using a principle of registration check of printing plate.

This image display device is provided with: a display portion which has an image display surface which can display an image and on which a first original is placed; a storage portion which stores original data of a second original which is an original before or after correction of the first original; and a display control portion which determines a display area which is an area on which an image of the second original is displayed and an area on which the first original is placed on the image display surface, and makes the display portion display the image of the second original based on the original data stored in the storage portion and the determined display area.