In a configuration for capturing an image of an object using a plurality of image sensors, the plurality of image sensors can be efficiently arranged in a limited space. Separating first light belonging to a predetermined wavelength band from incident light into a first direction which is a plane direction of a plane including an optical axis corresponding to a normal direction of an incident surface on which the incident light is incident. A first branching optical system, and a second part of the second light that is provided after the first branching optical system and in which the first light is separated from the incident light. A branching optical system comprising: a second branching optical system that separates certain third light in a second direction intersecting the plane. [Selection] Figure 4【課題】対象物の画像を複数の撮像素子を用いて撮像する構成において、当該複数の撮像素子を限られた空間内に効率よく配設可能とする。【解決手段】入射光から所定の波長帯域に属する第１の光を、前記入射光が入射する入射面の法線方向に対応する光軸を含む平面の面方向である第１の方向に分離する第１の分岐光学系と、前記第１の分岐光学系の後段に設けられ、前記入射光から前記第１の光が分離された第２の光から、当該第２の光の一部である第３の光を、前記平面と交わる第２の方向に分離する第２の分岐光学系と、を備える、分岐光学系。【選択図】図４
