Provided are: a method for producing a nasal drop composition suitable for treatment or prevention of a disease or symptom in the nasal cavities; and a nasal drop composition produced by the production method. The nasal drop composition production method characterized by including a mixing step of mixing earthworm castings with water and a collecting step of collecting vaporized water generated from a mixture obtained in the mixing step to obtain a liquid; and the nasal drop composition produced by the production method. It is preferred to further mix an organic substance together with the earthworm castings and the water in the mixing step.