To provide a compound having mPGES-1 inhibiting activity and useful for the prevention or treatment of a disease, such as pain, rheumatism, osteoarthritis, fever, Alzheimer disease, multiple sclerosis, arterial sclerosis, glaucoma, ocular hypertension, ischemic retinal disease, systemic scleroderma, and malignant tumor such as colon cancer.SOLUTION: The present invention provides a compound represented by the formula [I] or pharmaceutically acceptable salts thereof. [X is CH or N； ring Cy is a phenyl group having a substituent group such as halogen at at least one ortho position； Rindependently represent halogen or the like； m1 is an integer of 0-3].SELECTED DRAWING: None【課題】ｍＰＧＥＳ－１阻害活性を有し、疼痛、リウマチ、変形性関節症、発熱、アルツハイマー病、多発性硬化症、動脈硬化、緑内障、高眼圧症、虚血性網膜疾患、全身性強皮症及び大腸癌をはじめとする悪性腫瘍の予防又は治療のために有用なトリアジン化合物の提供。【解決手段】式［Ｉ］の化合物又はその薬学上許容される塩。［Ｘは、ＣＨ又はＮ；環Ｃｙは、少なくとも一方のオルト位にハロゲン等の置換基を有するフェニル基；Ｒ５は、各々独立にハロゲン等；ｍ１は、０～３の整数］【選択図】なし
