To provide a waterproof material, a waterproof door, a waterproof tool, and a waterproof door structure that enables effective use of the waterproof material capable of preventing water from flowing into an indoor side from an entrance which is opened and closed by a door by being contacted from the outside to a lower door stop portion and left and right side door stop portions of a door frame.SOLUTION: A waterproof material 30 comprises a lower extending portion 31 having an extending length in the left and right direction, and left and right side extending portions 32, 33 having extending lengths extending from the left and right ends of the lower extending portion 31 upward. By attaching the waterproof material 30 to a surface 1B on the indoor side of a door 1, etc., the lower extending portion 31 contacts a lower door stop portion of a door frame formed with an entrance which is opened and closed by the door 1 from the outside, the left and right side extending portions 32, 33 contact the left and right side door stop portions of the door frame from the outdoor side, and can prevent water from flowing into the indoor side from the entrance.SELECTED DRAWING: Figure 3
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