Image display device and display device

Abstract

To provide an image display device capable of improving display at a fovea of an eye, which is the most important part in a display range, such that display at the fovea of the eye is not darkened. There is provided an image display device including: at least one optical element unit including two optical elements facing each other, in which one optical element unit included in the at least one optical element unit includes a first optical element and a second optical element, an image is formed on the basis of image display light which transmits through the first optical element and is emitted to outside of the image display device, the first optical element has a deflection function of deflecting incident light which has a predetermined wavelength and is incident on the first optical element at a predetermined incidence angle to a side of the first optical element on which the incident light is incident, and emits first diffracted light deflected by the deflection function, the second optical element has a lens function for the first diffracted light which has a predetermined wavelength and is incident on the second optical element at a predetermined incidence angle, and a direction of the incidence angle of the incident light and a direction of a diffraction angle of the first diffracted light are different from a direction of an optical axis of the second optical element.