To provide a prophylactic/therapeutic pharmaceutical for inflammatory diseases, autoimmune diseases, bone/joint degenerative diseases, neoplastic diseases, etc., that has an interleukin 1 receptor-related kinase 4 (IRAK-4) inhibitory action.SOLUTION: Provided is a compound represented by the formula (I) or a salt thereof.SELECTED DRAWING: None【課題】インターロイキン1受容体関連キナーゼ4(IRAK-4)阻害作用を有し、炎症性疾患、自己免疫疾患、骨・関節変性疾患、腫瘍性疾患等の予防・治療医薬の提供。【解決手段】式(I)で表される化合物又はその塩。【選択図】なし