PROBLEM TO BE SOLVED: To provide an optical measurement device, etc. capable of emitting or receiving light in a state that an eyeball of a person to be measured is turned inward in the optical measurement in which light is emitted so as to cross the anterior chamber of the eyeball of the person to be measured, and the light that has crossed the anterior chamber is received.SOLUTION: An optical measurement device 1 includes: a first mirror 29 that emits light so that it crosses the anterior chamber of an eyeball 10 of a person to be measured； a second mirror 31 that receives the light that has crossed the anterior chamber； and a light emitting system holding part 50D that positions the first mirror 29 and the second mirror 31 at a position where the light emitted from the first mirror 29 in a state that the eyeball 10 is turned inward crosses the anterior chamber, and is received by the second mirror 31.SELECTED DRAWING: Figure 3【課題】被計測者の眼球の前眼房を横切るように光を出射し、前眼房を横切った光を受光する光計測において、被計測者の眼球を内転させた状態で光の出射および受光ができる光計測装置などを提供する。【解決手段】本発明の光計測装置１は、被計測者の眼球１０の前眼房を横切るように光を出射する第１ミラー２９と、前眼房を横切った光を受光する第２ミラー３１と、眼球１０が内転した状態において第１ミラー２９から出射された光が、前眼房を横切って第２ミラー３１によって受光される位置に、第１ミラー２９および第２ミラー３１を位置決めする発光系保持部５０Ｄとを備える。【選択図】図３
