A scattering medium measuring apparatus for performing measurement using time resolved spectroscopy method comprising N pieces (N represents an integer of 2 or more) of measuring modules (1,2) with each consisting of one light irradiating means for irradiating a scattering medium with pulse light irradiated from a predetermined light irradiating position (P 10, P 20) to measure internal information thereof non-invasively, and a plurality of light detecting means for detecting light irradiated from the light irradiating means and propagating through the inside of the scattering medium at predetermined light detecting positions (P 11, P 12; P 21, P 22) characterized by: timing instruction means for instructing the light irradiating means and the plurality of light detecting means included in each of the N pieces of measuring modules (1,2), respectively, on an irradiation timing and a detecting timing, wherein in each of the N pieces of measuring modules (1,2), an irradiation probe (60, 70; 22) of the light irradiating means is positioned a the center of the measuring module (1,2), detection probes (61a, 71a, 81a, 91a,; 41a) of the plurality of light detecting means are arranged around the irradiation probe (60, 70; 22) and the irradiation probe (60, 70; 22) and the detection probes (61a, 71a, 81a, 91a; 41a) are arranged so that each light detecting position (P 11, P 12; P 21, P 22) has the same distance from the light irradiating position (P 10, P 20) and wherein based on instruction signals from the timing instruction means N pieces of the light irradiating means corresponding, respectively, to the N pieces of measuring modules (1,2) are adapted to irradiate the scattering medium with the pulse light successively at the different irradiation timings, and wherein each of the plurality of light detecting means is adapted to detect light at the detection timing synchronized with the irradiation timing of the corresponding light irradiating means. timing instruction means for instructing the light irradiating means and the plurality of light detecting means included in each of the N pieces of measuring modules (1,2), respectively, on an irradiation timing and a detecting timing, wherein in each of the N pieces of measuring modules (1,2), an irradiation probe (60, 70; 22) of the light irradiating means is positioned a the center of the measuring module (1,2), detection probes (61a, 71a, 81a, 91a,; 41a) of the plurality of light detecting means are arranged around the irradiation probe (60, 70; 22) and the irradiation probe (60, 70; 22) and the detection probes (61a, 71a, 81a, 91a; 41a) are arranged so that each light detecting position (P 11, P 12; P 21, P 22) has the same distance from the light irradiating position (P 10, P 20) and wherein based on instruction signals from the timing instruction means N pieces of the light irradiating means corresponding, respectively, to the N pieces of measuring modules (1,2) are adapted to irradiate the scattering medium with the pulse light successively at the different irradiation timings, and wherein each of the plurality of light detecting means is adapted to detect light at the detection timing synchronized with the irradiation timing of the corresponding light irradiating means.