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), R
