Provided is a compound which has a mPGES-1 inhibitory activity and is useful for the prevention or treatment of pain, rheumatism, osteoarthritis, fever, Alzheimer's disease, multiple sclerosis, arteriosclerosis, glaucoma, ocular hypertension, ischemic retinal diseases, systemic sclerosis and malignant tumors including colorectal cancer. The present invention relates to a compound represented by formula [I] [wherein each symbol is as defined in the description] or a pharmaceutically acceptable salt thereof.