PROBLEM TO BE SOLVED: To provide a three-dimensional imaging optical system that is formed into compactness in size with a simple mechanism and can quickly switch over between a two-dimensional observation and a three-dimensional observation, and to provide an endoscope including the three-dimensional imaging optical system.SOLUTION: The three-dimensional imaging optical system comprises: a front lens group Gf that has a single optical axis Lc a rear lens group Gb that is disposed at a position facing an object with respect to the front lens group Gf and has the single optical axis Lc disposed on the same axis as the front lens group Gf a field of view limiting part 2 that is disposed at an image-formation plane Im performing one time image formation between the front lens group Gf and the rear lens group Gb or in the vicinity of the image-formation plane Im and limits a field of view a pupil division part 3 that is disposed in the rear lens group Gb and can divide a flux of light and a deflection part 4 that is disposed in the rear lens group Gb and deflects the flux of light.COPYRIGHT: (C)2014,JPO&INPIT【課題】 簡単な機構で小型に形成され、2次元観察と3次元観察とを迅速に切り替えることが可能な立体撮像光学系及びそれを備えた内視鏡を提供する。【解決手段】 立体撮像光学系は、単一の光軸Lcを持つ前レンズ群Gfと、前レンズ群Gfに対して物体と反対側に位置し、前レンズ群Gfと同軸に配置された単一の光軸Lcを持つ後レンズ群Gbと、前レンズ群Gfと後レンズ群Gbとの間で1回結像する結像面Im又は結像面Im近傍に配置され視野を制限する視野制限部2と、後レンズ群Gbに配置され光束を分割可能な瞳分割部3と、後レンズ群Gbに配置され光束を偏向する偏向部4と、を有することを特徴とする。【選択図】図1
