PROBLEM TO BE SOLVED: To provide a stereoscopic imaging optical system capable of reducing its dimension in the direction of an optical axis while improving optical axis performance, and an endoscope with the same.SOLUTION: A stereoscopic imaging optical system comprises, in order from an object side: a pair of negative lens groups 10 whose optical axes are arranged with a space between them a pair of first positive lens groups 20 on which light transmitted through the negative lens groups 10 is made incident an optical axis deflecting section 30 to which light transmitted through the first positive lens groups 20 is made incident, then, deflected, and emitted and a second positive lens group 40 to which light deflected and emitted by the optical axis deflecting section 30 is made incident. The optical axis deflecting section 30 includes a prism optical system 31. The prism optical system 31 has at least one reflecting face 31R1 or 31R2. The reflecting faces 31R1 and 31R2 are rotation asymmetrical with respect to a perpendicular at the intersection of a central main light ray LC and the reflecting faces 31R1 and 31R2.COPYRIGHT: (C)2014,JPO&INPIT【課題】 光軸性能を向上しつつ光軸方向の寸法を短縮することができる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、物体側から順に、間隔をあけてそれぞれの光軸が配置された一対の負のレンズ群10と、負のレンズ群10を透過した光が入射する一対の第1の正のレンズ群20と、第1の正のレンズ群20を透過した光が入射し、偏向して射出する光軸偏向部30と、光軸偏向部30により偏向され射出した光が入射する第2の正のレンズ群40と、を備え、光軸偏向部30は、プリズム光学系31を含み、プリズム光学系31は、少なくとも1つの反射面31R1,31R2を有し、反射面31R1,31R2は、中心主光線LCと反射面31R1,31R2との交点における垂線に対して回転非対称であることを特徴とする。【選択図】図1
