In a slit lamp microscope, ease of maintenance of an illumination-power-supply cable is improved while preventing the cable from appearing untidy.An illumination support arm 6 of a slit lamp microscope 1 is provided with a groove-shaped cable holder 6f in which the illumination-power-supply cable 13 is disposed along the outer surface of the illumination support arm 6 in an externally exposed state. This configuration facilitates replacement of the illumination-power-supply cable 13 even when a problem, such as breaking of the illumination-power-supply cable 13, occurs, thus improving ease of maintenance. Furthermore, because the illumination-power-supply cable 13 is disposed along the groove-shaped cable holder 6f, the slit lamp microscope 1 has a neat appearance.
