Image display apparatus

An image display apparatus comprising:

• a display device;
• and
• an observation optical system that includes a prism having at least a first surface, a second surface, and a third surface as optical surfaces, an internal space in the prism being filled with an optical medium,
• wherein the observation optical system is configured to enable light from an original image displayed on the display device to transmit the third surface, to reflect the light on the first surface, to reflect the light on the second surface, to transmit the light through the first surface, and to lead the light to an exit pupil,
• wherein the observation optical system has a first section that is a section containing an optical path of light from a center of the original image to a center of the exit pupil through the third surface, the first surface, the second surface, and the first surface, and a second section that is a section orthogonal to the first section, and
• wherein a reflection area for an internal reflection of the light on the first surface has a center part that is concave toward the exit pupil on the second section and a peripheral part at both sides of the center part has a convex shape toward the exit pupil on the second section.