PROBLEM TO BE SOLVED: To provide a sediment-retaining submarine having a membrane structure which is easy to construct and maintain, can stand on the seabed where waves and water currents are strong, and can directly store drift sand, at low cost. SOLUTION: This is a sediment-retaining submarine body having a membrane structure for forming a sediment-retaining submarine that is placed on the seabed and is capable of allowing drifting sand to enter and fill the filling. A vertical strip (1) in which two membrane members that allow seawater to pass through but do not allow sediment drift or the filling to pass through are erected in the sea and face each other, and a floating body (2) provided at the upper ends of the vertical strips (1). )When, A plurality of spacing members (4) connecting the weights (3) provided at the lower ends of the vertical strips (1) with the lower ends of the vertical strips (1) facing each other or between the weights (3). And the upper connecting body (5) that connects the upper parts of the vertical strips (1) facing each other or the floating bodies (2), and the upper connecting body (5) through which the drifting sand and the filling can pass, and the vertical strips facing each other ( It is characterized in that it is composed of at least a side band (6) provided between the side ends on at least one side of 1). [Selection diagram] Fig. 1
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