Patent ID: 7778694

Claim:
A biological optical measurement instrument comprising: a measurement probe adapted to be positioned to a surface of a subject, which irradiates light beams having a plurality of wavelengths from a light beam source through optical fibers onto the subject, and collects the light beams passed inside the subject from a plurality of positions to facilitate production of diagnostics from collected light beams of the subject, wherein the measurement probe is provided with probe casings formed in a cylindrical shape, which hold the optical fibers, fixing members to position the probe casings in a predetermined interval, and a support member which supports the fixing members and which is adapted to be attached to a head portion of the subject, and wherein the respective fixing member is provided with a predetermined width along an inner circumference thereof to permit fixed engagement of the respective probe casing with the respective fixing member, and a moveable support mechanism where a subject-contacting end portion of the optical fibers is movably retractable relative to the subject while supported in the fixed engagement with the respective fixing member.