It is intended to provide a nucleic acid represented by SEQ ID NO: 1 or 3; a protein represented by SEQ ID NO: 2 or 4; a recombinant vector containing a gene which comprises the above-described nucleic acid; a nonhuman primate NPY Y4 gene obtained by using a transformed cell containing the above-described recombinant vector; and so on. Moreover, it becomes possible to evaluate or screen a compound acting on the NPY Y4 receptor.