Optical device, projector, and imaging apparatus

An optical device comprising:

• a first reflective surface having a power;
• a second reflective surface disposed on a magnification side of the first reflective surface and having a power;
• a first optical element disposed on a magnification side of the second reflective surface, the first optical element having a first transmissive surface, a third reflective surface having a concave shape in an incident light ray direction, and a second transmissive surface different from the first transmissive surface, which are disposed in order from a reduction side to a magnification side;
• a third optical element having a fourth reflective surface disposed on the magnification side of the second reflective surface;
• and
• a fifth reflective surface disposed between the fourth reflective surface and the first transmissive surface, wherein
• the third reflective surface has a positive power, and
• the fourth reflective surface is disposed on a reduction-side conjugate surface side relative to the first reflective surface and the third reflective surface.