Patent ID: 8027084

Claim:
An inverted microscope comprising: a lens holding mechanism which includes a fixation part and a movable part fitted to cover the fixation part, wherein the movable part holds an objective lens so that the objective lens can revolve around a predetermined axis, and wherein the objective lens is arranged under a stage on which a sample can be placed; a focusing mechanism which holds the fixation part of the lens holding mechanism at an upper part of the focusing mechanism, and which moves the objective lens up and down together with the lens holding mechanism, a microscope main body which serves as a casing including the focusing mechanism therein, and which includes an opening through which the focusing mechanism and the lens holding mechanism are connected, wherein the opening is provided in an upper wall surface of the microscope main body; and a blockage member which is provided so as to be revolvable together with the movable part, and which blocks an intrusion of fluid spilled onto the lens holding mechanism into the opening, wherein a size of the lens holding mechanism and the blockage member projected onto a horizontal plane is larger than a size of the opening projected onto the horizontal plane.