An organic EL light-emitting device includes a substrate, thin films having a reflecting function formed on the substrate, an organic EL light-emitting layer, and upper electrodes. The thin films having a reflecting function are formed from an amorphous alloy, whereby there can be provided an organic EL light-emitting device having reflective films that have all of a reflecting function, a function of shielding transistors from light, and an electrode function, and moreover have little surface unevenness.