A quenching apparatus that can enhance hardenability is provided. A circulation apparatus (50) in the quenching apparatus recovers cooling fluid after the cooling fluid is used for quenching, and supplies the cooling fluid to a defoaming bath (431). A laminar flow weir (433) of a defoaming apparatus (4) partitions the defoaming bath (431) into a laminar flow bath (434) and a shallow bath (435). The laminar flow weir (433) is lower than a side wall of the laminar flow bath (434). Cooling fluid from the circulation apparatus (50) is supplied to the laminar flow bath (434), and the cooling fluid is poured into the shallow bath (435) from the laminar flow bath (434) along the laminar flow weir (433). A filter (432) is a plate shape or a sheet shape and has a mesh structure, and covers an opening in a bottom portion of the shallow bath (435). The liquid level height in the shallow bath (435) is less than the height of the laminar flow weir (433). A supply bath (441) accumulates cooling fluid that passes through the filter (432), and supplies the cooling fluid to a cooling apparatus that sprays the cooling fluid onto a metallic material.