Display apparatus

A display apparatus comprising:

• a display element;
• a display optical system configured to guide light from a display surface of the display element to an observation side;
• and
• two optical elements,
• wherein the display optical system includes a first half-transmissive reflective surface and a second half-transmissive reflective surface disposed on a cemented surface of the two optical elements,
• wherein the light from the display surface transmits through the second half-transmissive reflective surface, is reflected on the first half-transmissive reflective surface, is reflected on the second half-transmissive reflective surface, transmits through the first half-transmissive reflective surface, and is guided to the observation side,
• wherein an absolute value of a curvature of the second half-transmissive reflective surface is larger than an absolute value of a curvature of the first half-transmissive reflective surface, and
• wherein the display surface has a convex shape toward the observation side in at least one of two mutually orthogonal sections that include an optical axis of the display optical system.