The present invention aims to provide an image combiner and an image display device which can easily have a wide field of view and reduce a thickness of a substrate while reducing loss of light intensity by means of a PBS. An image combiner includes a substrate transparent to visible light; and a polarization beam splitter installed in the substrate to reflect a light flux introduced into the substrate from an image-display element and to make the light flux incident on an exit pupil outside the substrate. An exit angle θ0 at which a principal ray of the light flux emitted from a center of a display surface of the image-display element is emitted from a surface of the substrate toward a center of the exit pupil satisfies a condition of 3°≦θ0.