The organic electronic device element encapsulating resin composition, an organic electronic device element encapsulation resin sheet, an organic electroluminescence device, and an image display device

The invention, The invention, together to balance between the adhesive force and the water vapor barrier property, the water content lowered, by sufficiently suppressing the generation of outgas, resulting in an organic electronic device element long life it is possible to also look at the time of sealing good organic electronic device element encapsulation resin composition provides an organic electronic device element encapsulation resin sheet, an organic electroluminescence device, and an image display device. The organic electronic device element encapsulating resin composition of the present invention, contains a weight average molecular weight (Mw) of polyisobutylene resins 10,000 to 300,000 (A) and hydrogenated cyclic olefin-based polymer (B) and the water content is 500ppm or less by Karl Fischer method, and outgas generation amount when heated 1 hour at 85 ° C. is characterized in that at 500ppm or less.