The present invention relates to a natural ventilation apparatus for windows with excellent assembly and structural strength and, more specifically, to a new technology which allows smooth ventilation of an indoor space using a natural ventilating opening without opening windows and which reduces production costs and improves marketability by significantly improving the assembly of the natural ventilating opening. The present invention enables users to conveniently assemble a pair of divided front end caps and a pair of divided rear end caps to the front and rear sides of a body frame; and secures a wide vent area by preventing the central part of a filter installed inside a filter housing from coming in contact with the inner side of the filter housing.
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