A 
carboxylic acid compound represented by formula (I): (meanings of the symbols in the formula are as mentioned in the specification) and a pharmaceutical agent comprising the compound. <>Since the compound represented by formula (I) binds to a DP 
receptor and shows antagonistic activity for the DP 
receptor, it is useful for prevention and / or treatment of diseases such as allergic 
disease (such as allergic rhinitis, 
allergic conjunctivitis, 
atopic dermatitis, bronchial 
asthma and 
food allergy), systemic mastocytosis, disorders accompanied by systemic 
mast cell activation, 
anaphylaxis shock, 
bronchoconstriction, urticaria, eczema, diseases accompanied by itch (such as 
atopic dermatitis and urticaria), diseases (such as cataract, 
retinal detachment, 
inflammation, infection and 
sleeping disorders) which is generated secondarily as a result of behavior accompanied by itch (such as 
scratching and beating), 
inflammation, chronic 
obstructive pulmonary diseases, 
ischemic reperfusion injury, cerebrovascular accident, chronic 
rheumatoid arthritis, 
pleurisy, 
ulcerative colitis and the like. 
Carboxylic acid compounds represented by the following general formula (I) (wherein each symbol is as defined in the description) and drugs containing these compounds: (I) Because of binding to DP 
receptor and antagonizing the same, the compounds represented by the general formula (I) are useful in preventing and / or treating allergic diseases (allergic 
nephritis, 
allergic conjunctivitis, 
atopic dermatitis, bronchial 
asthma, 
food allergy, etc.), systemic 
mast cell disease, systemic 
mast cell activation failure, 
anaphylactic shock, 
respiratory tract contraction, urticaria, eczema, diseases associated with itch (atopic dermatitis, urticaria, etc.), diseases (cataract, 
retinal detachment, 
inflammation, infection, 
sleep disorder, etc.) secondarily caused by behaviors associating itch (
scratching, beating.