Disclosed is a medical observation device comprising: a columnar microscope part that outputs a captured image signal by magnifying a minuscule section of a subject being observed and capturing an image thereof； and a support part including a first joint part that holds the microscope part rotatably about a first axis which is parallel to the height direction of the microscope part, a first arm part that holds the first joint part and that extends in a different direction from the height direction of the microscope part, a second joint part that holds the first arm part rotatably about a second axis which is orthogonal to the first axis, and a second arm part that holds the second joint part. The medical observation device is configured such that, in a plane that passes through the first and second axes, the cross section of each of the microscope part, the first and second joint parts, and the first and second arm parts is included within a circle that has the focus position of the microscope part as the center thereof and that passes through an end point of the first joint part which is at the greatest distance from the focus position. Thus, at the time of capturing an image of a subject being observed and displaying the image, it is possible to sufficiently secure a field of view for a user to observe the displayed image.L'invention concerne un dispositif d'observation médicale, comprenant : une partie de microscope en colonne qui délivre un signal d'image capturée par grossissement d'une section minuscule d'un sujet observé et par capture d'une image de celui-ci ； et une partie de support comprenant une première partie d'articulation qui maintient la partie de microscope de façon rotative autour d'un premier axe qui est parallèle à la direction de hauteur de la partie de microscope, une première partie de bras qui maintient la première partie d'articulation et qui s'étend dans une direction différente de la direction de hauteur de la partie de microscope, une se
