Abstract: The invention relates to a light shielding device for a microscope and a microscope including the same. In the microscope, transmitting illumination light from a transmitting illumination light source (1) is irradiated from above a stage (3) to a specimen on the stage and fluorescent illumination light from a fluorescent illumination light source is irradiated from below the stage to the specimen on the stage. The light shielding device (20) may be mounted to a lower end portion of a condenser (2) of the microscope to at least partially block ambient light entering an objective (4) of the microscope. The light shielding device may comprise a light shield (21) and a mounting mechanism configured to mount the light shield below the lower end portion of the condenser in a manually removable manner, and/or the light shield comprises a through hole (23) and a light shielding portion surrounding the through hole.