According to one embodiment, there is provided a multistage-pressure condenser, including a first condenser (1), a second condenser (2) and a third condenser (3), which are arranged in increasing order of internal pressure, the first condenser (1) and the second condenser (2) each including a first partition (5) in which perforations (5P) from which condensate obtained by condensing turbine steam by cooling water drops are formed on a cooling water inflow side of the condenser rather than at a central part thereof, and a second partition (6) which partitions a reheating room (7) for reheating condensate dropping from the perforations (5P) in a direction perpendicular to an inflow direction of the cooling water, and a heating-steam flow path (8) which supplies heated steam from the third condenser (3) to the reheating room (7) partitioned by the first partition (5) and the second partition (6).