Enables gastric inhibitory peptide receptor activity and peptide hormone binding activity. Involved in several processes, including desensitization of G protein-coupled receptor signaling pathway; positive regulation of cell communication; and response to glucose. Located in plasma membrane. Used to study type 2 diabetes mellitus. Biomarker of hyperglycemia. Human ortholog(s) of this gene implicated in cardiovascular system disease; diabetes mellitus; and obesity. Orthologous to human GIPR (gastric inhibitory polypeptide receptor). [provided by Alliance of Genome Resources, Apr 2022]