Provided are: a particulate composition which exhibits high water dispersibility regardless of the kind of solid particles； and a method for producing this particulate composition. Also provided are: a liquid composition； a surface modifying agent and a method for improving water dispersibility. The present invention additionally provides: a particulate composition which has dispersibility in an oil-based material； and a method for producing this particulate composition. A particulate composition according to the present invention contains solid particles and an amphiphilic substance that is present on the surfaces of the solid particles； and the amphiphilic substance has an ability of forming vesicles in water. A method for producing a particulate composition according to the present invention comprises: a step for preparing a mixture of solid particles and a solvent in which amphiphilic substance that has an ability of forming vesicles in water is dissolved； and a step for removing the solvent in the mixture.
