Provided are a method of evaluating stress, a stress-evaluating apparatus, a stress-evaluating method, a stress-evaluating system, a stress-evaluating program and a recording medium, which are capable of evaluating a stress state accurately by utilizing the concentration of amino acids related to a stress state among amino acids in blood. According to the method of evaluating stress of the present invention, amino acid concentration data on the concentration value of amino acid in blood collected from a subject to be evaluated is measured, and a stress state including at least depressive illness and major depressive illness in the subject is evaluated based on the concentration value of at least one of Lys, His, ABA, Asn, Phe, Leu, Ile, Val, Trp, Tyr and Met contained in the measured amino acid concentration data of the subject,
METHOD FOR EVALUATION OF STRESS, STRESS EVALUATION APPARATUS, STRESS EVALUATION METHOD, STRESS EVALUATION SYSTEM, STRESS EVALUATION PROGRAM, AND RECORDING MEDIUM