Provided is a therapeutic or prophylactic agent for mood disorders anxiety schizophrenia Alzheimer s disease Parkinson s disease Huntington s chorea eating disorders hypertension digestive diseases drug dependence epilepsy cerebral infarction cerebral ischemia cerebral edema head injury inflammation immune related diseases depilation and so on. More specifically provided is a fused azole derivative represented by general formula (I) which has arginine vasopressin 1b receptor antagonism or a pharmaceutically acceptable salt thereof.