1. An image display device comprising: a display panel that displays a sheet of image; a spatial region setting unit that defines a plurality of spatial regions where an image displayed on said display panel can be visually recognized from mutually different spatial positions; an image splitter that splits a piece of image having a larger display area than said sheet of image corresponding to a display area of said display panel, into a plurality of sheets of images respectively corresponding to each of said plurality of spatial regions; and an image display unit that causes said display panel to splitly display said plurality of sheets of images in different display directions, such that each of said plurality of sheets of images split by said image splitter can be visually recognized from the corresponding one of said mutually different spatial positions, further comprising: an inclination detector that detects an inclination of said display panel; wherein said image display unit displays one of said plurality of sheets of images in correlation with said spatial region, according to a detection result provided by said inclination detector.