PURPOSE: A windshield for a window is provided to improve sealing and soundproof performance by preventing the inflow of wind and noise to the inside while smoothly draining rainwater. CONSTITUTION: A windshield for a window comprises a body (11), a tight protrusion (12), a drain (13), a drain hole (14), a cut-off stopped part, and a check valve (16). The body is equipped with a compression protrusion (11a) to be inserted in between the rails of a window frame of which windows are overlapped. A plurality of tight protrusions is formed in the top of the body at an optimal gap to be closely attached to the bottom of a window. The drain and drain hole are crossed in the bottom of the body. Both sides inside the drain are formed with the cut-off stopped part. The cut-off stopped part is installed by the check valve for preventing backflow.
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