A manufacturing method includes a first step of performing swage autofrettage on an object; a second step of heat soaking the object; and a third step of performing hydraulic autofrettage on the object. The organic electroluminescent display device including a lower electrode, an organic electroluminescent film, and an upper electrode on a substrate arranged in this order, wherein the upper electrode is divided in units of a pixel or dot by a partition having an insulating property. High voltage wires are connected, in series, to high voltage electrodes of the lamps.