The purpose of the present invention is to provide a novel aromatic compound capable of having GPR40 agonistic activity and activity in accelerating GLP-1 secretion. A compound represented by formula (I) (wherein the symbols are as defined in the description) or a salt thereof can have GPR40 agonistic activity and activity in accelerating GLP-1 secretion. The compound or salt can be useful in the prevention/treatment of cancers, obesity, diabetes, hypertension, hyperlipidemia, cardiac failure, diabetic complications, metabolic syndrome, sarcopenia, etc. and have excellent medicinal activity.
