To provide a bicyclic compound having an acetyl-CoA carboxylase inhibitory action. Formula: [Each symbol in the formula is as described in the specification. The compound represented by the above or a salt thereof has an acetyl-CoA carboxylase inhibitory action, is useful for the prevention and treatment of cancer, inflammatory diseases and the like, and has an excellent medicinal effect.アセチル-CoAカルボキシラーゼ阻害作用を有する二環性化合物を提供すること。式:[式中の各記号は、明細書に記載の通りである。]で表される化合物またはその塩は、アセチル-CoAカルボキシラーゼ阻害作用を有し、癌、炎症性疾患等の予防・治療に有用であり、かつ優れた薬効を有する。