It is an object of the present invention to provide a transgenic non-human animal, which can appropriately evaluate properties, pharmacological effects and safety of a molecular targeted substance or targeted drug to a human specific molecule, and to provide a method for producing the transgenic non-human animal, which comprises a gene encoding a human specific molecule and a gene encoding a human Fc³ receptor family, both genes being introduced in the animal, thereby expressing the gene encoding a human specific molecule and the gene encoding a human Fc³ receptor family.