PROBLEM TO BE SOLVED: To provide an optical measurement device for eyeballs, etc. capable of assisting turning inward or outward of eyeballs of a person to be measured.SOLUTION: An optical measurement device 1 includes an optical system 20 used for measuring characteristics of the aqueous humor in the anterior chamber 13 of eyeballs 10 of a person to be measured, and a holding part 50 for holding the optical system 20, etc., the optical system 20 including a light emitting system 20A and a light receiving system 20B. An optical path 28 is set so that when the eyeballs 10 are turned inward or outward, the light emitted from the light emitting system 20A passes so as to cross the anterior chamber 13, and is received by the light receiving system 20B.SELECTED DRAWING: Figure 1【課題】被計測者の眼球が内転又は外転した状態となるように補助することができる眼球の光計測装置等を提供する。【解決手段】光計測装置1は、被計測者の眼球10の前眼房13における眼房水の特性の計測に用いる光学系20、光学系20などを保持する保持部50を備え、光学系20は、発光系20Aと受光系20Bとを備えている。光路28は、眼球10を内転又は外転させたとき、発光系20Aから出射した光が前眼房13を横切るように通過し、受光系20Bで受光できるように設定されている。【選択図】図1