In order to provide a robust encapsulating structure, an organic light emitting display device, includes an organic light emitting display device, comprising a substrate, an organic light emitter on the substrate comprising a laminated structure of a first electrode, an organic light emitting layer, and a second electrode, a first inorganic film configured to cover the organic light emitter and being formed from a first inorganic mixture comprising tin oxide, phosphorus oxide and tin fluoride, and a second inorganic film configured to cover the first inorganic film and comprising tin oxide and phosphorus oxide.