<p>Disclosed is a compound useful as an EP1 receptor antagonist. Studies are made on EP1 receptor antagonists, and it is confirmed that a compound having a sulfonamide structure in which a nitrogen atom in the sulfonamide structure is substituted by a 2-fluoropropyl group, a 3-fluoro-2-methylpropyl group or the like has a potent antagonistic activity on an EP1 receptor. The sulfonamide compound has a potent antagonistic activity on an EP1 receptor and therefore can be used as a prophylactic and/or therapeutic agent for a lower urinary tract symptom or the like.</p>
