Display apparatus capable of reducing luminance unevenness and color unevenness

A display apparatus, comprising:

• an imaging light generating device;
• and
• an optical system on which imaging light emitted from the imaging light generating device is incident, wherein
• the optical system includes a first optical unit having positive power, a second optical unit having positive power and including a first diffraction element, a third optical unit having positive power, and a fourth optical unit having positive power and including a second diffraction element forming an exit pupil due to the imaging light,
• the first optical unit, the second optical unit, the third optical unit, and the fourth optical unit being aligned in order along an optical path of the imaging light, and
• the second diffraction element is constituted of a volume hologram and has, in a cross-sectional view of the volume hologram, interference fringes continuously varying in pitch and inclination thereof from one end toward another end of the second diffraction element, and the second diffraction element has, in a front view of the volume hologram, interference fringes continuously varying in curvature radius thereof from the one end toward the other end of the second diffraction element, and wherein
• on the optical path, a first intermediate image of the imaging light is formed at a position between the first optical unit and the third optical unit,
• a pupil is formed at a position between the second optical unit and the fourth optical unit,
• a second intermediate image of the imaging light is formed at a position between the third optical unit and the fourth optical unit, and
• the exit pupil is formed on an opposite side of the fourth optical unit from the third optical unit.