Disclosed is a sulfonamide compound having a chemical structure characterizedin that the compound has an amide structure wherein a carbon atom in the amide bindsto a nitrogen atom in a sulfonamide through a lower alkylene, or a salt of the compound. The compound or the salt has a potent antagonistic activity against an EP1 receptorand is therefore useful as a therapeutic agent for a disease associated with anEP1 receptor, particularly lower urinary tract symptom.