Provided is a technique that makes it possible to reduce the size of an ophthalmic surgical microscope for viewing a patient's eye and acquiring an OCT image. An ophthalmic surgical microscope according to an embodiment of the present invention includes an illuminating optical system, a viewing optical system, an objective lens, an interference optical system, a first lens group, a second lens group, and a deflecting member. The illuminating optical system illuminates a patient's eye by illumination light. The viewing optical system is used for viewing a patient's eye illuminated by the illuminating optical system. The objective lens is disposed in a viewing optical path. The interference optical system divides light from a light source into measurement light and reference light, and detects interference light of the reference light and light returning from the measurement light from the patient's eye. The first lens group is disposed in the optical path of the measurement light between the light source and the patient's eye. The second lens group is disposed in the optical path of the measurement light between the first lens group and the patient's eye. The deflecting member is disposed in the optical path of the measurement light between the first lens group and the second lens group.L'invention concerne une technique qui permet de réduire la taille d'un microscope chirurgical ophtalmique pour l'observation de l'œil d'un patient et d'acquérir une image OCT. Un microscope chirurgical ophtalmique selon un mode de réalisation de la présente invention comprend un système optique d'éclairage, un système optique de visualisation, une lentille d'objectif, un système optique d'interférence, un premier groupe de lentilles, un deuxième groupe de lentilles, et un élément de déviation. Le système optique d'éclairage éclaire l'œil d'un patient au moyen de lumière d'éclairage. Le système optique de visualisation est utilisé pour visionner l'œil d'un patient éclairé par le systè
