Optical system and projector

An optical system configured to project a projection image formed on a reduction-side conjugated plane on an enlargement-side conjugated plane as an enlarged image, the optical system comprising:

• a first optical system having a first optical element;
• and
• a second optical system arranged at a reduction side of the first optical system, wherein
• an intermediate image conjugated with the reduction-side conjugated plane and the enlargement-side conjugated plane is formed between the first optical system and the second optical system,
• the first optical element has a first reflecting surface having a concave shape,
• the second optical system has a first relay element, a second relay element arranged at an enlargement side of the first relay element, and a correction optical element arranged at the enlargement side of the second relay element,
• the first relay element has a first relay reflecting surface having a concave shape,
• the second relay element has a second relay reflecting surface having a convex shape, and
• the correction optical element curves the intermediate image generated by the first relay element and the second relay element to reduce a field curvature generated by the first optical element.