A hydroponic culture apparatus (100) is equipped with a culture vessel (106) which constitutes a flow path through which a nutrient solution (50) can flow, a nutrient solution vessel (108) in which the nutrient solution (50) is to be stored, a supply flow path (109) through which the nutrient solution (50) is guided from the nutrient solution vessel (108) to the culture vessel (106), a discharge flow path (110) through which the nutrient solution (50) is guided from the culture vessel (106) to the nutrient solution vessel (108), a pump (107) which can circulate the nutrient solution (50) between the nutrient solution vessel (108) and the culture vessel (106) through the supply flow path (109) and the discharge flow path (110), and a discharge filter (202) which is arranged inside of the culture vessel (106) and through which a specific foreign matter is removed from the nutrient solution (50) that flows from the culture vessel (106) into the discharge flow path (110), wherein the discharge filter (202) has a
