An electro-optical device includes an electro-optical panel including a pair of substrates and an electro-optical layer between the pair of substrates, a protective member composed of a light-transmitting substrate mounted on at least one of the pair of substrates, and a holding member that holds the electro-optical panel. The protective member has a thick portion where the thickness of the light-transmitting substrate is large, thin portions where the thickness of the light-transmitting substrate is small, the thin portions being provided at the outer circumference of the light-transmitting substrate, and step portions provided between the thick and thin portions. The holding member has fitting portions that are nested into the step portions of the protective member. The light-transmitting substrate and the electro-optical panel are bonded to each other with an adhesive layer.