The subject of the present invention is to provide a microarray for introducing nucleic acid, the microarray capable of introducing and expressing nucleic acid into cells simply by adding the nucleic acid onto a plate and the like, and then seeding the cells thereon and culturing them without adding a nucleic acid-introducing reagent or additives. The subject is achieved by preparing the microarray including atelocollagen, a gene-introducing agent and nucleic acid on a plate and the like for the introduction of nucleic acid. The nucleic acid can be introduced into a cell by seeding cells into which nucleic acids are introduced on the microarray and culturing them without the need of preparing a mixture of viral vectors, nucleic acids and a nucleic acid-introducing agent after culturing cells or the need of adding a nucleic acid-introducing agent and additives.