PROBLEM TO BE SOLVED: To provide an ophthalmologic apparatus that allows an optical element to be mounted correctly, and an optical element used for the same.SOLUTION: An ophthalmologic apparatus for imaging the angulus iridocornealis of an eye to be examined includes a projection optical system for projecting an illumination light onto the angulus iridocornealis of the eye to be examined； and a mounting part that can mount an optical element inserted on an optical axis of the projection optical system. The mounting part includes regulation means for regulating the posture of the optical element. For example, the regulation means may regulate a rotation angle around an optical axis of the optical element.SELECTED DRAWING: Figure 8【課題】光学素子を正しく装着することができる眼科装置、およびそれに用いる光学素子を提供する。【解決手段】被検眼の隅角を撮影する眼科装置であって、前記被検眼の隅角へ照明光を投光する投光光学系と、前記投光光学系の光軸上に挿入される光学素子を装着可能な装着部と、を備え、前記装着部は、前記光学素子の姿勢を規制する規制手段を備えることを特徴とする。例えば、前記規制手段は、前記光学素子の光軸回りの回転角度を規制してもよい。【選択図】図８
