Method for producing purified feline erythropoietin

The purpose of the present invention is to provide an improved means for producing purified feline erythropoietin (fEPO). This method for producing purified fEPO includes: a pH adjustment step for adjusting the pH of a protein solution including fEPO to within a range of 4-7; and a purification step for bringing the protein solution, the pH of which was adjusted in the pH adjustment step, into contact with a carrier provided with cation exchange groups, adsorbing the fEPO, and then eluting the fEPO from the carrier.