Optical element and display device

An optical element comprising:

• a plurality of partially reflecting mirrors that are provided in parallel to each other with an interval therebetween, reflect a part of an image light and a part of an external light, and transmit the other part of the image light and the other part of the external light;
• and
• a transmittance member that is interposed between adjacent two partially reflecting mirrors of the plurality of partially reflecting mirrors,
• wherein the transmittance member has an incidence surface on which the image light and the external light are incident through a light guiding body, and an exit surface from which the image light and the external light are exited to an observer side, and
• wherein each of the plurality of partially reflecting mirrors is disposed so as to be inclined with respect to the incidence surface and the exit surface, and a reflectance of light incident at a relatively small incidence angle with respect to surfaces of each partially reflecting mirror is lower than a reflectance of light incident at a relatively large incidence angle.