| abstract |
The object of the present invention is to provide a positive wavelength dependence in the entire wavelength range of 400 to 800 nm, and a single sheet can give a specific phase difference to transmitted light in the wavelength range, and has a low water absorption and a low photoelastic coefficient. And providing an optical film excellent in heat resistance, a method for producing the same, a polarizing plate protective film comprising the film, and a polarizing plate using the film. An optical film contains a norbornene resin having a structural unit (I) represented by the following general formula (I). [Selection figure] None |