A method for manufacturing the following device is provided: an electro-optical device which includes a pair of substrates holding a display material having optical properties varied by electric stimulation and which has a curved shape. The method includes covering the front and rear faces of a display with a pair of protective films and then bonding end portions of the protective films to each other with an adhesive containing a thermoplastic resin, the end portions being located outside the display; heating the bonded end portions to melt the adhesive and then bending the display depending on applications; and solidifying the melted adhesive by cooling to allow the protective films to hold the display bent.