To easily perform operation with a simple structure.

This sampling device 1 of the soft ground has a vertically extending cylindrical body 4 supported in an eccentric position of a driving shaft 2 supported so as to be liftably drivable and rotatingly drivable, and a cover body 5 for closing a lower end side opening 4a of the cylindrical body 4. The cover body 5 gathers a ground sample in the prescribed depth in the ground into the cylindrical body 4 by lowering the driving shaft 2 in a state of opening the lower end side opening 4a. The cover body 5 is relatively rotatably supported to the cylindrical body 4 around a shaft 13 parallel to the driving shaft 2. The driving shaft 2 relatively rotates by friction with the surrounding ground when rotated in the normal rotation direction R1, and checks rotation by a closing position locking pin 15 in a position for closing the opening 4a. The driving shaft 2 relatively rotates by friction with the surrounding ground when rotated in the reverse rotation direction R2, and checks rotation by an opening position locking pin 16 in a position for opening the opening 4a.