A confocal microscope unit according to an embodiment includes: a first subunit which includes a light source, a pinhole plate, and a photodetector; a second subunit which includes a light source, a pinhole plate, and a photodetector; a scan mirror which scans excitation light on a sample and guides fluorescence generated from the sample to the first and second subunits; a scan lens which guides the excitation light and guides the fluorescence to the scan mirror; and a main housing which is attachable to a connection port and to which the scan mirror, the scan lens, and the subunits are fixed, wherein the first subunit includes a dichroic mirror that separates the excitation light and fluorescence handled by the own unit from those handled by the second subunit.