To solve the problem that the optical brain-function measurement apparatus of the prior art, once worn around the head of a subject, is difficult to change the position of the light source unit or the detection unit, so that it is not suited for measuring brain functions at an arbitrary position.SOLUTION: An optical brain-function measurement apparatus includes: a light source unit for generating infrared light to be applied to a human head； a detection unit for detecting infrared light that is diffused and reflected within the human head and exits the head from one or more head positions； and an optical system for guiding infrared light emitted from the light source unit to the human head and for controlling an infrared-light application position on a surface of the human head. At least one of the light source unit and the detection unit is a non-contact type, which is not brought into contact with a human body. One or more human head positions from which infrared light exit and are detected by the detection unit include positions that are different from the infrared-light application positions controlled by the optical system.SELECTED DRAWING: Figure 1【課題】一旦装着体を頭部に装着すると、光源部、検出部の位置を変えることが難しく、任意の位置の脳機能を計測するには適さない。【解決手段】人体頭部に照射する赤外光を生成する光源部と、人体頭部内で拡散反射し、人体頭部の１つ以上の位置から出射した赤外光を検出する検出部と、光源部から出射した赤外光を人体頭部に導くとともに、赤外光の人体頭部表面上の照射位置を制御する光学系を備え、光源部、および検出部の少なくとも一方が前記人体と接触しない非接触型であり、検出部が検出する赤外光が出射する前記人体頭部の１つ以上の位置は、光学系が制御する光の照射位置と少なくとも異なる位置を含む。【選択図】図１
