The purposes of the present invention are: to reduce the running costs of a plant cultivation apparatus； to improve the nutrient-solution absorption rate of cultivated plants； to promote growth of the cultivated plants； and to increase the yield of the cultivated plants. The present invention is provided with a long, narrow, and hollow cultivation box in which roots of cultivated plants hang. Nutrient-solution supply tubes are attached along side-wall inner surface in the length direction. Nozzles for spraying a fluid comprising the nutrient solution are attached to each of the nutrient-solution supply tubes, with a required interval therebetween. The spray from the nozzles includes small particles having a particle size of less than 20 µm, and large particles having a particle size in the range of 20-100 µm inclusive. The spray from the nozzles has an average particle size in the range of 10-30 µm.
