An image display apparatus has one display screen configured to display images corresponding to a plurality of observers. The image display apparatus includes illumination unit for emitting a first light flux and a second light flux in at least two different directions in a time sharing manner, and a transmissive display element configured to display in a time sharing manner a first image using the first light flux as illumination light and a second image using the second light flux as illumination light. The illumination unit includes a first light source which emits the first light flux, a second light source which emits the second light flux, a first light guiding plate which projects the first light flux only in a direction to a first observer, and a second light guiding plate which projects the second light flux only in a direction to a second observer.