To provide an inorganic material making method capable of efficiently synthesizing a large number of inorganic materials in a short time with raw materials in small amounts and small energy consumption, which is suitable for simultaneously preparing samples of different compositions in making a large number of inorganic materials to search a novel functional material.

The method has (i) a process of injecting two or more raw material solutions each containing a different metal constituent into two or more sample containers to fill the containers each with an amount specified for the sample container to prepare two or more sample solutions each having a different composition, (ii) a process of taking the sample solutions prepared by the process (i) and spraying the sample solutions onto different points on a substrate and (iii) a process of heating the substrate sprayed with the sample solutions to form two or more inorganic materials on the substrate.