To provide a cooling fan control device capable of solving excessive cooling of a light source, erroneous settings of a mode by a user, erroneous determination of failure, and a noise problem.SOLUTION: A cooling fan control device 10 controls rotation operation of a cooling fan 20 for cooling a light source 30. The cooling fan control device 10 comprises an atmospheric pressure sensor 11 for detecting outside pressure, an altitude value calculation unit 12 for calculating an altitude value on the basis of the atmospheric pressure value detected by the atmospheric pressure sensor 11 at the time of lighting the light source 30, a movement determination unit 13 for determining the presence or absence of movement to a place different in an altitude according to whether or not an altitude difference between a first altitude value calculated by the altitude value calculation unit 12 in lighting this time and a second altitude value calculated by the altitude value calculation unit 12 in lighting at the previous time is equal to or more than a threshold value, and a fan control unit 14 for controlling rotation speed of the cooling fan 20 on the basis of a movement presence/absence determination result.SELECTED DRAWING: Figure 1
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