Optical element, display device, and manufacturing method for optical element

An optical element comprising:

• a plurality of partially reflecting surfaces which are provided parallel to each other with intervals therebetween, which reflect a portion of image light and a portion of external light, and which transmit another portion of the image light or another portion of external light;
• and
• a light transmitting member which supports the plurality of partially reflecting surfaces,
• wherein the light transmitting member includes an incident plane which enters the image light and the external light, and an emission plane which emits the image light and the external light, and
• wherein each of the plurality of the partially reflecting surfaces is disposed so as to be inclined with respect to the incident plane and the emission plane and has a plurality of regions having different reflectances in an inclination direction.