The invention to that relates to a vehicular rain water off the device, to give prevent rain water as possible to the case of rain, to get on and off, and the user can enable or disable the chayangmak by operation of a simple switch, it is easy to apply to vehicles of various types developed by; By connecting the top of the roof to be close contact with the vehicle door and the door, in the vehicle rain water barrier that prevents the rainwater from flowing between the interior in accordance with the opening and closing of the door; And the shaft mounting portion is formed extending along the inner bottom of the roof to be close contact with the inner side of the vehicle door according to the longitudinal direction, said shaft mounting portion and a housing consisting of a barrier discharge groove extending in a longitudinal direction so as to penetrate and connect the external; And the mounting portion is formed to be able to at least three places at least fixed to the inner bottom of the roof, including the both ends of the housing; The shaft is inserted into the mounting portion of the housing, but rotation but excellent in elastic restoring force to the bending and torsion shaft and made of a soft material capable of at least 360 ° twist; A return spring that is formed on both ends of the shaft so that the shaft rotates in a certain direction returns to the initial position by the elastic restoring force and; Made in the form of a synthetic resin fabric of the elastic binary one end is the fixed to the shaft is wound, the other end is extended to the outside through a barrier discharge groove of the housing that end has jidoe made to the affected in a magnetic material wherein the discharge groove when in the closed door is not inserted into a blocking layer is mounted in close contact with the plate to the top of the door and; The plate is formed in the upper end of which contact the door, while the current is supplied by a switch formed inside the automobile vehicle rain water, characterized by configured the plate by at least one electromagnet to be fixed to the top of the door by the magnetic block to an apparatus.