MOBILE TIDE PREVENTION DEVICE

PROBLEM TO BE SOLVED: To provide a mobile tide prevention device capable of coping with a large storm wave, dispensing with a wide space conventionally, and smoothly moving a tide embankment. SOLUTION: This mobile tide prevention device is provided with a gravity type tide embankment 20 having buoyancy adjustment means floating to the water surface and grounding to the water bottom and becoming the tide embankment by being grounded on a prescribed tide embankment installation part, and a tide embankment storage part 11 having its one end side provided with an opening part 12 facing to the tide embankment installation part and being continued to the tide embankment installation part through the opening part 12. The tide embankment body 20 stored in the tide embankment body storage part 11 is floated to the water surface to reciprocate between the tide embankment body storage part 11 and the tide embankment body installation part, and the tide embankment body 20 is grounded in the prescribed installation position of the tide embankment body installation part so as to be the tide embankment.