PURPOSE: To provide a method and an apparatus which can evaluate accurately and conveniently the degree of fatigue by using the numerical value being closely related to the degree of fatigue obtd. by using a computer.

CONSTITUTION: A method for measuring the degree of fatigue wherein the degree of fatigue is evaluated by a method wherein a program moved on a computer is used and a figure is displayed repeatedly on a display at an irregular interval and the time until the subject to be examined pushes a key from displaying the figure is measured to obtain the mean value (the numerical value A) of the time and the dispersion value (the numerical value B) and when the time aN until the subject to be examined pushes a key from displaying the figure of the N times does not satisfy the condition of a general formula A-kB≤aN≤A+kB (0.5≤k≤2.0), this data is thrown away and the mean value of the data except the thrown data (the numerical value X) is displayed in a table or in a figure to evaluate the degree of fatigue, is provided.