A hydroponics device (100) includes: a cultivation tank (106) that constitutes a flow channel through which a nutrient solution (50) to be supplied to a plant (10) flows； a nutrient solution tank (108) that reserves the nutrient solution (50)； a supply flow channel (109) that guides the nutrient solution (50) from the nutrient solution tank (108) to the cultivation tank (106)； a discharge flow channel (110) that guides the nutrient solution (50) from the cultivation tank (106) to the nutrient solution tank (108)； and a pump (107) that circulates the nutrient solution (50) between the nutrient solution tank (108) and the cultivation tank (106) by way of the supply flow channel (109) and the discharge flow channel (110). The supply flow channel (109) has a ventilation path (VP) that allows an external space of the supply flow channel (109) and an internal space of the supply flow channel (109) to communicate with each other. The ventilation path (VP) inhibits a variation in a flow rate of the nutrient solution (50) flowing into the cultivation tank (106) from the supply flow channel (109).
