The present invention provides a novel method for identifying an olfactory receptor included in one olfactory cell. In the present invention, amplified is the cDNA derived from the mRNA of the one olfactory cell by a PCR method using a forward primer represented by SEQ ID: 01 and a reverse primer represented by SEQ ID: 02. Subsequently, determined is whether or not a gene sequence of the amplified cDNA corresponds with one gene sequence included in gene sequences coding for olfactory receptors included in the mouse olfactory receptor group A. Finally, determined is that the olfactory receptor included in the one olfactory cell is the olfactory receptor which corresponds to the one gene sequence which corresponds with the gene sequence of the cDNA in the previous step, if the gene sequence of the cDNA corresponds with the one gene sequence in the previous step.