PROBLEM TO BE SOLVED: To provide an optical measurement system for an eyeball that secures an optical path traversing an anterior chamber of eye more readily than when switching means for switching an incident position of light to light reflection means is not included therein.SOLUTION: An optical measurement system 1 for an eyeball 10 includes: a mirror 27 for reflecting light in a direction of traversing an anterior chamber 13 of the eyeball 10； and a deflection part 23 and a drive device 28, as an example of switching means for switching an incident position of light to the mirror 27 so as to inhibit movement of an optical path from a state of traversing the anterior chamber 13.SELECTED DRAWING: Figure 1【課題】光反射手段への光の入射位置を切り替える切替手段を備えない場合に比べて、前眼房を横切る光路の確保が容易な眼球の光計測装置を提供する。【解決手段】眼球１０の光計測装置１は、光を、眼球１０の前眼房１３を横切る方向に反射させるミラー２７と、光路が前眼房１３を横切る状態からの移動を抑制するように、ミラー２７への光の入射位置を切り替える切替手段の一例としての偏向部２３と駆動装置２８とを備えている。【選択図】図１
