OPTICAL DEVICE

To provide an optical device capable of simply and accurately adjusting angles of an optical element.SOLUTION: A distance measuring device 100 includes: a prism 34 rotating around an axis of rotation 70; a spherical surface pedestal part 43 in at least a part of which a convex spherical surface 63 is formed; a light source support part 44 installed in the way that it swings on the convex spherical surface 63 of the spherical surface pedestal part 43; and a light source 40 and a collimator lens 41. Here, a central position Pc of the convex spherical surface 63 exists on a reflection surface 51 of the prism 34 which an axis of rotation 70 crosses, and the light source support part 44 moves around the central position Pc. Even when the light source support part 44 is swung on the convex spherical surface 63 of the spherical surface pedestal part 43, an optical axis of incident light L1 is made incident to a point on the reflection surface 51 crossing the axis of rotation 70.SELECTED DRAWING: Figure 2 【課題】光学素子の角度調整を簡易かつ正確に実行可能な光学装置を提供する。【解決手段】測距装置１００は、回転軸７０を中心に回転するプリズム３４と、少なくとも一部に球面状の凸球面６３が形成された球面台座部４３と、球面台座部４３の凸球面６３上で摺動するように設置される光源支持部４４と、光源４０及びコリメータレンズ４１とを備える。ここで、凸球面６３の中心位置Ｐｃは、回転軸７０が交わるプリズム３４の反射面５１上に存在し、光源支持部４４は、中心位置Ｐｃを中心として移動する。そして、光源支持部４４を球面台座部４３の凸球面６３上で摺動させた場合であっても、投射光Ｌ１の光軸は、回転軸７０と交わる反射面５１上の点に入射する。【選択図】図２