Nakatsukasa-sho was regarded as the most important ministry among the eight central ministries, because it administered all duties related to the Imperial Court, such as assisting the Emperor, proclaiming the imperial edict, conferring the court rank.
天皇の補佐や、詔勅の宣下や叙位など、朝廷に関する職務の全般を担っていた為に、八省の中でも最も重要な省である。