The invention each end for the natural ventilation of windows and doors that can adjust the available and ventilation capacity adjusting the width is in the stage in response to the depending on the thickness change of the ventilator glass that is provided between the glass and windows frames for natural ventilation it relates to a stage finish areas, more particularly that said closing outdoor outside upper end of the frame and the upper fitting end bent downward, the center extends into the lower portion of the outdoor upper stage the end portion of the outside frame insert Outdoor insertion end is formed, the lower surface is formed bent in the lower direction of the lower insertion end of the outdoor insertion end of the outdoor lower end 23 extending into the lower portion of, the indoor upper stage the upper fitting of the closed interior frame stage top fitting groove to be fitted is formed in plurality of lines, the indoor upper stage indoor insert that is inserted into the outdoor insertion end stage formed center extending to a lower portion of the inside of the outdoor inserting end flaps of the opening and closing operation in the indoor side operating portion is coupled to, the lower that the top surface of an interior lower end extends into the lower portion of the interior insertion end the lower-fit end fitting insertion groove is configured plurality of lines, the glass and windows frames according to the thickness of the glass byeonhwadoem fitted which is configured to adjust the width of a fitted closed indoor / outdoor frame the upper / lower end fitting so as to correspond to the change in the width of the natural ventilation apparatus in the upper / lower insertion groove.