The present invention provides an sulfonamide derivative having DP receptor antagonistic activity and a pharmaceutical composition comprising the said compound as an active ingredient, and further a therapeutic agent for treating allergic diseases. A compound of the general formula (II): wherein the ring A is an aromatic carbocyclic ring etc.； the ring B is a nitrogen-containing non-aromatic heterocyclic ring etc.； the ring C is an aromatic carbocyclic ring etc.； R1 is carboxy etc.； R2 is independently a halogen atom etc.； R3 is optionally substituted alkyloxy etc.； R4 is independently a halogen atom etc.； R5 is independently optionally substituted alkyl etc.； M is sulfonyl etc.； Y is a single bond etc.； L1 is a single bond etc.； L2 is a single bond etc.； k is 0, 1, 2, 3 or 4； n is 0, 1 or 2； and q is 0, 1, 2 or 3； provided that a) k is not 0 when the ring B is a 6-membered nitrogen-containing heterocyclic ring containing one or two nitrogen atom(s) and the ring C is a benzene ring, etc.； a pharmaceutically acceptable salt or a hydrate thereof.
