A plant growing device includes: a container (1) configured to reserve a nutrient solution (F) in a lower portion of the container (1) a holding unit (2) configured to hold plants (P) inside the container (1) spray units (3) configured to spray the nutrient solution (F) toward the inside of the container (1) and support units (5) configured to support the holding unit (2), and to move the holding unit (2) to a position depending on how the spray units (3) are driving, in a range from a spray region (D1) where the nutrient solution (F) sprayed by the spray units (3) is supplied to roots (Q) of the plants (P) to an immersion region (D2) where the nutrient solution (F) reserved in the container (1) is supplied to the roots (Q) of the plants (P).
