PROBLEM TO BE SOLVED: To provide novel analog compounds of glucose dependent insulinotropic polypeptide (GIP), pharmaceutical compositions comprising the compounds, and methods for using the compounds as GIP receptor agonists or antagonists for treating diseases mediated by GIP receptor such as insulin independent diabetes and obesity.SOLUTION: Disclosed is a compound represented by Formula (I): RR)-A-A-A-Gly-Thr-Phe-A-Ser-Asp-Tyr-A-Ile-A-A-Asp-Lys-Ile-His-Gln-Gln-Asp-Phe-Val-Asn-Trp-Leu-Leu-Ala-A-A-A-A-A-A-A-A-A-A-A-A-A-A-A-R, or a pharmaceutically acceptable salt thereof.SELECTED DRAWING: None【課題】グルコース依存性インスリン分泌刺激ポリペプチドのアナログ(GIP)の新規の化合物、前記化合物を含む医薬組成物、並びにGIP受容体に仲介される病気、例えばインスリン非依存性糖尿病及び肥満の治療の為のGIP受容体作動薬或いは拮抗薬としての前記化合物の使用方法提供。【解決手段】式(I)で表される化合物、又はその医薬的に許容される塩。(R2R3)-A1-A2-A3-Gly4-Thr5-Phe6-A7-Ser8-Asp9-Tyr10-A11-Ile12-A13-A14-Asp15-Lys16-Ile17-His18-Gln19-Gln20-Asp21-Phe22-Val23-Asn24-Trp25-Leu26-Leu27-Ala28-A29-A30-A31-A32-A33-A34-A35-A36-A37-A38-A39-A40-A41-A42-A43-R1(I)【選択図】なし