The present invention ensures performance and reliability of a top-emission-type organic EL display device, reduces manufacturing steps by simplifying the structure of the display device, and reduces a manufacturing cost. TFTs each of which has a semiconductor layer, a gate insulation film which covers the semiconductor layer and a gate electrode are formed on a substrate. An interlayer insulation film is formed on the substrate to cover the TFTs. Lower layer portions of SD lines formed of a multi-layered film which are formed on the interlayer insulation film constitute a lower electrode of an organic EL layer, and a passivation film which covers the TFTs and the SD lines plays a role of a bank which separates pixels. An uppermost layer of the SD line is formed of a chemically stable metal oxide film, and the SD layer is used as it is. On the other hand, as a lower electrode of an organic EL layer, an upper layer of the SD line is removed and an Al—Si alloy film of the SD line is used. Due to such a constitution, it is possible to reduce a cost by shortening steps while holding the performance and the reliability of organic EL.