A method of manufacturing a mounting case for an electro-optical device which is used in an electro-optical device on which a display image is displayed and accommodates an electro-optical panel having an image display region on which the display image is displayed, the method comprising:
- forming a main body that has a plate member formed by a pressing process, a bottom portion opposite to the peripheral region located around the image display region in the electro-optical panel and side portions continuous with the bottom portion to surround the side edge of the electro-optical panel so that the electro-optical device is accommodated therein;
- and
- forming a cooling air introducing portion into which a portion corresponding to the circumferential edge of the main body of the plate member is partially formed by a pressing process and that is formed by the bending process in the pressing process so as to introduce cooling air supplied toward the main body onto the outer surface of the bottom portion, which is performed at the same time or consecutively with the formation of a main body.