Optical body, film adhesive body, and method for manufacturing optical body

An optical body, comprising:

• an optical film, on one surface of which is formed a first micro concave-convex structure in which an average cycle of concavities and convexities is less than or equal to a visible light wavelength;
• and
• a master film that covers the first micro concave-convex structure, wherein the optical film and the master film are separable from each other,
• wherein the master film is provided with a second micro concave-convex structure formed on a surface that faces the first micro concave-convex structure,
• wherein the second micro concave-convex structure has an elastic modulus of from 700 MPa to 1500 MPa, is made of a cured curing resin, and has a reverse shape of the first micro concave-convex structure, and
• wherein an elastic modulus of the optical film is from 300 MPa to 700 MPa, and wherein the elastic modulus of the optical film provides for the separability between the optical film and the master film.