An image display apparatus, including: a display element which displays an image; and an eyepiece optical system through which image light from the display element is directed to a pupil of an observer, characterized in that the eyepiece optical system includes: an eyepiece prism which guides the image light inside the eyepiece prism; and a volume-phase holographic optical element which diffraction-reflects the image light guided inside the eyepiece prism, the eyepiece prism has: two mutually parallel flat surfaces (21b, 21c); and a bonding surface which connects together the two flat surfaces (21b, 21c) and to which the holographic optical element is bonded, the image light is totally reflected at least once on each of the two flat surfaces (21b, 21c) and is then incident on the holographic optical element, the bonding surface is in a shape having a curvature only in one direction, and has a curvature in a sectional plane that includes a normal to the display element and normals to the two parallel flat surfaces (21b, 21c) and that also includes a center of a display surface of the display element, and in the sectional plane, diffraction directions at which light emanating from the center of the display surface and light emanating from at least one point other than the center are diffraction-reflected on the holographic optical element are directions that produce non-zero angle differences at a same side with respect to regular reflection directions of the respective light on the bonding surface. a display element which displays an image; and an eyepiece optical system through which image light from the display element is directed to a pupil of an observer, characterized in that the eyepiece optical system includes: an eyepiece prism which guides the image light inside the eyepiece prism; and a volume-phase holographic optical element which diffraction-reflects the image light guided inside the eyepiece prism, an eyepiece prism which guides the image light inside the eyepiece prism; and a volume-phase holographic optical element which diffraction-reflects the image light guided inside the eyepiece prism, the eyepiece prism has: two mutually parallel flat surfaces (21b, 21c); and a bonding surface which connects together the two flat surfaces (21b, 21c) and to which the holographic optical element is bonded, two mutually parallel flat surfaces (21b, 21c); and a bonding surface which connects together the two flat surfaces (21b, 21c) and to which the holographic optical element is bonded, the image light is totally reflected at least once on each of the two flat surfaces (21b, 21c) and is then incident on the holographic optical element, the bonding surface is in a shape having a curvature only in one direction, and has a curvature in a sectional plane that includes a normal to the display element and normals to the two parallel flat surfaces (21b, 21c) and that also includes a center of a display surface of the display element, and in the sectional plane, diffraction directions at which light emanating from the center of the display surface and light emanating from at least one point other than the center are diffraction-reflected on the holographic optical element are directions that produce non-zero angle differences at a same side with respect to regular reflection directions of the respective light on the bonding surface.