The cooling apparatus (10) for electronic-device exhaustion includes an evaporator unit (201), a fluid piping (306) and a vapor piping (305). A plurality of evaporator units (201) is disposed in a rack (100) in the height direction, and have a dimension in height of any of 2U, 3U, and 4U with 1U being 44.45 mm. The evaporator unit causes a coolant fluid thereinside to vaporize and produce a coolant vapor by heat of the exhaust air from an electronic device loaded in the rack (100), and cools the exhaust air. The fluid piping (306) is a supply route of the coolant fluid to the evaporator units (201), the vapor piping (305) is a discharging route of the coolant vapor from the evaporator units (201), and both are commonly connected to the plurality of evaporator units (201).