The purpose of the present invention is to provide a plant body cooling device with which it is possible to improve the effect of cooling a plant body. The plant body cooling device (1) according to the present invention is provided with a mist generator (10) and an airflow supply unit (20). The mist generator (10) is disposed above a cultivation plot (50) in which a plant body (70) is cultivated. The mist generator (10) generates a mist from a nozzle unit (12). The airflow supply unit (20) supplies an airflow, in a direction intersecting the direction of gravity, to the mist falling from the mist generator (10).
