LIGHT CONTROLLING FILM

The present invention is to propose a light reflecting film that can effectively improve reflectance of only a specific polarized light while maintaining high visible light transmittance, as well as a light controlling film, an optical film, a functional glass and a head-up display including the same. A light reflecting film comprises at least two light reflecting layers that are laminated, the at least two light reflecting layers including at least one of light reflecting layers among a light reflecting layer PRL-1, a light reflecting layer PRL-2 and a light reflecting layer PRL-3, the light reflecting layer PRL-1 having a central reflection wavelength of greater than or equal to 400 nm but less than 500 nm and a reflectance to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%, the light reflecting layer PRL-2 having a central reflection wavelength of greater than or equal to 500 nm but less than 600 nm and a reflectance to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%, the light reflecting layer PRL-3 having a central reflection wavelength of greater than or equal to 600 nm but less than 700 nm and a reflectance to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%, the at least two light reflecting layers having central reflection wavelengths that are different from each other. All of the at least two light reflecting layers that are laminated have a property of reflecting polarized light having the same orientation.