The present invention relates to phosphoric acid derivatives represented by general formula (I), wherein each symbol is as defined in the description and nontoxic salts thereof. Because of having a TNF.alpha. production inhibitory effect, the compounds represented by general formula (I) are useful as preventives and/or remedies for rheumatoid arthritis, ulcerative colitis, Crohn's disease, hepatitis, sepsis, hemorrhagic shock, multiple sclerosis, cerebral infarction, diabetes, interstitial pneumonia, uveitis, pain, glomerulonephritis, HIV-associated diseases, cachexia, myocardial infarction, chronic heart failure, oral aphtha, Hansen's disease, infection, etc. ##STR1##