An organic-inorganic composite having two or more kinds of light emission sites, wherein the organic-inorganic composite comprises: metal oxide particles; and an organic polymer compound having a polymer chain and an organic ligand which is bonded to the polymer chain through a covalent bond, wherein the organic ligand is generated from at least one selected from an organic compound which contains a phenolic hydroxyl group and a heterocyclic ring having a nitrogen atom as a heteroatom and forms a complex by using the hydroxyl group and nitrogen, an organic compound which contains a phenolic hydroxyl group and a carbonyl group and forms a complex by using these, and an organic compound which has a β-diketone structure and forms a complex by using this, wherein the organic polymer compound is bonded to the metal oxide particles in a manner in which the organic ligand forms a complex with metal atoms on the surface of the metal oxide particles; and the light emission site is the complex formed of the organic ligand and the metal atoms; the number of the combinations of the ligand and the metal atoms on the surface of the metal oxide particles corresponds to the number of the kinds of the target light emission site, the number of emission colors of the organic-inorganic composite is two or more, and at least one of the following characteristics (a) to (d) is satisfied by the organic-inorganic composite, wherein (a) the combination of the organic ligand and the metal atoms on the surface of the metal oxide particles is a combination of one kind of metal atom and plural kinds of organic ligands, or a combination of plural kinds of metal atoms and one kind of organic ligand, or a combination of these two kinds of combinations; (b) the organic-inorganic composite is a mixture of two or more kinds of organic-inorganic composites having different emission colors; (c) the polymer chain has plural kinds of the organic ligand; and (d) the metal oxide particles are composite metal oxide particles wherein plural kinds of metal atoms are present on the surface of one metal oxide particle. metal oxide particles; and an organic polymer compound having a polymer chain and an organic ligand which is bonded to the polymer chain through a covalent bond, wherein the organic ligand is generated from at least one selected from an organic compound which contains a phenolic hydroxyl group and a heterocyclic ring having a nitrogen atom as a heteroatom and forms a complex by using the hydroxyl group and nitrogen, an organic compound which contains a phenolic hydroxyl group and a carbonyl group and forms a complex by using these, and an organic compound which has a β-diketone structure and forms a complex by using this, wherein the organic polymer compound is bonded to the metal oxide particles in a manner in which the organic ligand forms a complex with metal atoms on the surface of the metal oxide particles; and (a) the combination of the organic ligand and the metal atoms on the surface of the metal oxide particles is a combination of one kind of metal atom and plural kinds of organic ligands, or a combination of plural kinds of metal atoms and one kind of organic ligand, or a combination of these two kinds of combinations; (b) the organic-inorganic composite is a mixture of two or more kinds of organic-inorganic composites having different emission colors; (c) the polymer chain has plural kinds of the organic ligand; and (d) the metal oxide particles are composite metal oxide particles wherein plural kinds of metal atoms are present on the surface of one metal oxide particle.