Phenylimidazole derivative, and therapeutic medicine or preventive medicine for inflammatory disease, etc

Provided is a medicinal active ingredient which is useful for treating or preventing inflammatory diseases, diseases caused by lipid oxidation, retinochoroidal disorders, etc. The present invention is a phenylimidazole derivative represented by formula (IB) or a salt thereof. The present invention is also therapeutic medicine or preventive medicine for inflammatory diseases, diseases caused by lipid oxidation, retinochoroidal disorders, etc., the medicine comprising at least one type selected from the phenylimidazole derivative, a salt thereof and metabolites thereof as an active ingredient. In formula (IB), R1a is an alkyl group, etc., R2 is an amino group, etc., R3 is a halogen atom, alkyl group, etc., R4 is a cyano group, etc., R5 is an alkyl group, etc., and R6 is an alkyl group, etc.