A microscope includes a microscope main unit including a stage on which a specimen is to be placed; and a light source provided on the microscope main unit and emitting illumination light for illuminating the specimen. The microscope also includes a main power supply operable to be turned on and off; a sensor that senses the presence or absence of a subject in a front or side area of the microscope main unit; a determining unit that determines based on a result of the sensing whether the subject moves; and a control unit that turns on the light source when the main power supply is turned on, maintains the light source in an ON state when the determining unit determines that the subject moves, and turns off the light source when the determining unit determines that the subject does not move and a predetermined period of time passes.