1. A biological optical measurement apparatus comprising an applied unit having plural light irradiating probes for applying light to an object and plural light detecting probes for detecting light returning from the object, and worn by the object, a measuring unit for measuring the amount of light detected by the light detecting probes, a two-dimensional image constructing unit for constructing two-dimensional topographic images from the measurement result of the detected light amount, and a monitor for displaying the two-dimensional topographic images, characterized by further comprising a three-dimensional image constructing unit for making the two-dimensional topographic images correspond to measurement positions and superposing the two-dimensional topographic images in order of measurement time to thereby construct a three-dimensional image, the thus-constructed three-dimensional image being displayed on the monitor.