Powdered oil composition and production method thereof, and method of improving the functionality of the oil-in-water emulsion

Disclosed are a powdered oil composition with excellent dispersibility in water, a production method thereof, and a method of improving the functionality of an oil-in-water emulsion. The powdered oil composition is configured to contain: either an amphiphilic substance that spontaneously forms closed vesicles in an aqueous system, or a sugar polymer which forms sugar polymer particles; an oil component; and an excipient. When mixed with water, the powdered oil composition forms an oil-in-water emulsion through the effect of the aforementioned closed vesicles or the aforementioned sugar polymer particles. Ideally, the content of the amphiphilic substance or of the sugar polymers allows the emulsion state of the oil droplets derived from the oil component to be maintained.