[Problem] To provide a compound useful as an active ingredient of a pharmaceutical composition, e.g., a pharmaceutical composition for the treatment of chronic renal failure and/or diabetic nephropathy. [Solution] The inventors conducted in-depth studies of compounds having an EP4 receptor-antagonizing effect, discovered an amide compound or salt thereof having an EP4 receptor-antagonizing effect, and perfected the present invention. The amide compound or salt thereof has an EP4 receptor-antagonizing effect and can be used as an active ingredient of a pharmaceutical composition for the prevention and/or treatment of various diseases in which EP4 is involved, e.g., chronic renal failure and/or diabetic nephropathy.
