The present invention creates an indole 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 generic formula (I) wherein the ring A is an aromatic carbocyclic ring etc.; the ring B is a 3- to 8-membered nitrogen-containing non-aromatic heterocyclic ring etc.; R1, R2, R3, R4 and R5 are independently a hydrogen atom or a halogen atom etc.; R6 is C2-C4 alkyloxy etc.; R7 is independently a halogen atom etc.; R8 is independently C1-C4 alkyl etc.; R9 is carboxy etc.; Y is a single bond etc.; M is sulfonyl etc.; L1, L2 and L3 are a single bond or alkylene optionally containing one or two heteroatoms etc.; n is 0 etc.; q is 0 etc.;a pharmaceutically acceptable salt or hydrate thereof.