The hole injecting electrode should preferably be composed of a material that can inject holes in the high-resistance inorganic hole injecting and transporting layer with high efficiency and has a work function of 4.5 eV to 5.5 eV, for instance, a material composed mainly of any one of tin-doped indium oxide (ITO), zinc-doped indium oxide (IZO), indium oxide (In2O3), tin oxide (SnO2), and zinc oxi