The present invention relates to a safety rail for ships to be able to adjust the length of the safety rail assembled between the railing holding and to maintain a solid fixed state without falling off the railing holding even if the flow up and down. The present invention for realizing this includes a safety rail for ships installed between railings vertically erected, including a first rail and a second rail which draws out to the outside in a state inserted into the first rail. Ends of the first and second rails are fixed to the railing column, respectively, by clamping means, and the clamping means is installed on the railing column, and a semicircular pipe having a space formed therein in an open state at the upper end thereof; A body coupled to the end of each of the two rails, and a flow preventing jaw that is provided on the front end of the body and is caught on the locking jaw formed at the front end of the semicircular pipe in a state of being fitted in the space of the semicircular pipe and installed below the body. The technical gist of the present invention consists of a bracket that is caught in contact with the bottom surface of the semicircular pipe.
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