Provided is an imidazolylbenzene compound or salt thereof that controls HCV replication and in addition is particularly capable of strongly controlling HCV replication, and is very effective in the prevention and treatment of HCV infection when used in combination with another agent for treating HCV infection such as Interferon.이미다졸릴벤젠 화합물 또는 그의 염은, HCV의 복제를 억제하고, 또한 인터페론 등의 HCV 감염증의 다른 치료제와 병용함으로써, 특히 강력하게 HCV의 복제를 억제할 수 있어, HCV 감염증의 예방 및 치료에 극히 유효하다.