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