The present invention relates to a protein complex, in which a physiologically active polypeptide modified with a fatty acid molecule and an immunoglobulin Fc region are linked through a non-peptide polymer linker, a pharmaceutical composition comprising the same, and a method for preparing the protein complex. The protein complex extends the blood half-life of the physiologically active polypeptide through the linkage of the binding site of immunoglobulin Fc and the intramolecular bonding of the fatty acid molecule； has an excellent in vivo activity； and has no risk of inducing an immune response.
