Provided is a method for easily peeling an adhesive optical film from a glass substrate whereupon an adhesive optical film is adhered, without damaging the glass substrate and without leaving an adhesive on the glass substrate. An adhesive optical film used in such peeling method is also provided. In the method for peeling the adhesive optical film from the optical-film-adhered glass substrate wherein the adhesive optical film is adhered on the glass substrate, the optical-film-adhered glass substrate is exposed to an environment at a temperature of 40-98 DEG C and a relative humidity of 60-99% for three minutes or longer, then, under the such environment, the adhesive optical film is peeled from the glass substrate.