An electro-optical device encased in a mounting case having an image display region, on which projection light from a light source is incident, includes a mounting case including a plate disposed to face one surface of the electro-optical device and a cover to cover the electro-optical device, a portion of the cover abutting against the plate, the mounting case accommodating the electro-optical device by holding at least a portion of the peripheral region located at the circumference of the image display region of the electro-optical device with at least one of the plate and the cover. Then, at least one of the plate and the cover being bonded to the electro-optical device.