An image display apparatus includes: an imaging device inputting sequentially information of an observer; a position calculation unit calculating positions of a single eye of the observer from the information sequentially; a difference calculation unit calculating a difference between the position of the single eye calculated at a present time and a previous time; a projection position determination unit determining a target value of a projection position of a light beam on the single eye from the difference; and a projector presenting an image to the observer by projecting the light beam to the projection position.