Abstract: An evaporation source for supporting an organic material for vapor deposition which comprises a nonwoven fabric constituted with a fiber comprising silicon oxide, wherein thermal conductivity of the nonwoven fabric is 0.01 to 1.0 Wm?1K?1, a process for producing an optical member comprising heating the evaporation source to vapor deposit the organic material for vapor deposition on the surface of an optical member, and an optical member produced in accordance with the process. A material for vapor deposition can be vapor deposited stably with small change in the temperature, a vapor deposited film having uniform thickness and concentration can be formed, and an optical member exhibiting excellent performance of the vapor deposited film can be produced at a small cost.