PROBLEM TO BE SOLVED: To provide a novel arylamide derivative compound which have blocking activities of voltage gated sodium channels as the tetrodotoxin-sensitive (TTX-S) channels and is useful in treating pain.SOLUTION: There is provided a compound represented by formula (I) or a pharmaceutically acceptable salt thereof (where X represents C or N； Rrepresents fluorinated methyl, fluorinated propyl, fluorinated ethylene ether, fluorinated propylene ether, or the like； Rrepresents H, halogen, hydroxyl or the like； and Rand Rrepresent H, or Calkyl, N, O, S, a ring formed by bonding to each other or the like).【課題】テトロドキシン感受性（TTX－S）チャネルとして電位依存性ナトリウムチャネルの遮断活性を有する疼痛の治療用に有効な新規アリールアミド誘導体化合物の提供。【解決手段】構造式（Ｉ）で示される化合物又は薬学的に許容されるそれらの塩。（Ｘは、Ｃ又はＮ；Ｒ１はフッ素化メチル、フッ素化プロピル、フッ素化エチレンエーテル、フッ素化プロピレンエーテル等；Ｒ２はＨ、ハロゲン、ヒドロキシル等；Ｒ３及びＲ４は、Ｈ、又はＣ１－６アルキル、Ｎ、Ｏ、Ｓ、環形成等）【選択図】なし
