PURPOSE: A seashore underground water monitoring system is provided to generate a warning to limit use of underground water in case seawater infiltrates into underground water by monitoring a fresh salt water interface in real time and measuring fresh water lens thickness variation or fresh-salt water interface depth variation. CONSTITUTION: A seashore underground water monitoring system includes a fresh-salt water interface position tracking apparatus(1), a first measurement sensor(100), and a first transmission unit. The fresh-salt water interface position tracking apparatus is inserted into an observation well which measures underground water in a seashore region and moves according to variation of buoyancy on a fresh-salt water interface. The first measurement sensor includes a distance measurement unit. The distance measurement unit is inserted into the observation well, is located in part higher than the positioning tracking apparatus, and measures a first distance with the fresh-salt water interface positioning tracking apparatus. The first measurement sensor includes the first transmission unit which transmits the measured first distance.
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