A floating type structure comprising: a hull; a recess (20, 320) formed in the hull; a loading arm provided on the hull; a plunger connected to the loading arm; a plunger base which is connected to the recess formed (20, 320, 330) in the hull, into which the plunger is inserted, and which includes a pressure adjusting hole formed at a lower portion of the plunger base; a cylinder which connects the plunger to the plunger base and adjusts a height of the loading arm, wherein the plunger is coupled to a first end of the cylinder and the plunger base is coupled to a second end of the cylinder opposite said first end to ascend or descend the plunger inside the plunger base; a drain formed in the recess; a first drain pipe that is connected to the drain and discharges a fluid accumulated in the recess; and a second drain pipe connected to the pressure adjusting hole allowing air to flow in and out the plunger base; and a connection pipe which connects a pipe installed on the hull to the loading arm and which allows a height from the hull to be adjustable, wherein the first drain pipe is connected to the second drain pipe; and the second drain pipe discharges the fluid introduced from the first drain pipe, wherein the recess includes: a first recess in which the loading arm is disposed; and a second recess in which the connection pipe is disposed, wherein a lower surface of the second recess is formed to be closer to an upper surface of the hull than a lower surface of the first recess; and the drain is formed in the first recess. a hull; a recess (20, 320) formed in the hull; a loading arm provided on the hull; a plunger connected to the loading arm; a plunger base which is connected to the recess formed (20, 320, 330) in the hull, into which the plunger is inserted, and which includes a pressure adjusting hole formed at a lower portion of the plunger base; a cylinder which connects the plunger to the plunger base and adjusts a height of the loading arm, wherein the plunger is coupled to a first end of the cylinder and the plunger base is coupled to a second end of the cylinder opposite said first end to ascend or descend the plunger inside the plunger base; a drain formed in the recess; a first drain pipe that is connected to the drain and discharges a fluid accumulated in the recess; and a second drain pipe connected to the pressure adjusting hole allowing air to flow in and out the plunger base; and a connection pipe which connects a pipe installed on the hull to the loading arm and which allows a height from the hull to be adjustable, wherein the first drain pipe is connected to the second drain pipe; and the second drain pipe discharges the fluid introduced from the first drain pipe, wherein the recess includes: a first recess in which the loading arm is disposed; and a second recess in which the connection pipe is disposed, wherein a lower surface of the second recess is formed to be closer to an upper surface of the hull than a lower surface of the first recess; and the drain is formed in the first recess. a first recess in which the loading arm is disposed; and a second recess in which the connection pipe is disposed, wherein a lower surface of the second recess is formed to be closer to an upper surface of the hull than a lower surface of the first recess; and the drain is formed in the first recess.