[Object] to provide a cooling mechanism and a cooling method for a culture apparatus, which utilize the fact that a reactor tube of a tubular closed photobioreactor (PBR) is composed of a transparent glass tube, and can be used to simply reduce costs by the heat of evaporation by a small amount of fresh water. [Solution] the cooling mechanism of the algae culture apparatus includes a sensor for measuring environmental factors that become conditions for watering, a liquid temperature meter 9 provided at an outlet of a reactor 3 and measuring a water temperature, a timer 11 a for setting the start or stop time of watering, a water spray device 12 having a water spray nozzle 12 a for spraying water to the reactor, An automatic electric valve 10 capable of opening and closing a valve for supplying fresh water to the water spray device, and a control system...

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