It is intended that the biological probe 1, and behavior information measuring section 2, and an apparatus main body 3, to diagnose biological functions by using near-infrared spectroscopy, biological function diagnostic apparatus of the present invention, the apparatus body and two-dimensional diagram based on the optical information from the organism probe 1 is a plot of the variation of reduced hemoglobin and change in the amount of oxidized hemoglobin, 3, the absolute of reduced hemoglobin and the absolute amount of oxidized hemoglobin a control unit 8 which calculates the various parameters are derived based on the two-dimensional diagram showing the relationship between the amount and behavior information input section 12 for inputting the action information measured by the activity information measuring unit 2, calculated by the control unit 8 and a display unit 10 for displaying various images on the basis of the action information entered in the behavior information input various parameters and / or the, [Selection Figure Figure 2
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