To provide a reflected light diffusing film for a liquid crystal monitor having a superior reflectance and low reflection directivity and to provide a reflected light diffusing film for a liquid crystal monitor excellent further in adhesion to a printed layer which prevents the emission of a bright line.

The reflected light diffusing film comprises a polyester resin film containing many microvoids and the difference between the average reflectance of the film in the wavelength range of 400-700 nm and the average reflectance, when an aluminum sheet is disposed on the back face of the film, is ≥1%.