The present invention pertains to a peptide compound which is useful for treatment or prevention of obesity, diabetes, etc. More particularly, the present invention pertains to a peptide compound represented by formula (I): P1-Tyr-Aib-Glu-Gly-Thr-a-MePhe-Thr-Ser-Asp-Lys(-Gly-Gly-Gly-Gly-RA10)-A11-A12-Aib-Leu-A15-Lys-Gln-A18-Gln-Iva-Glu-Phe-Val-Arg-His-Leu-Leu-Asn-Lys-Aib-Thr-Arg-Gln-Arg-A35-NH2 (in the formula, symbols are as defined in the description), and to treatment or prevention of obesity, diabetes, etc., using the peptide compound.
