PURPOSE: To suck soil and stones by utilizing atmospheric pressure and water pressure and transfer them, by ejecting jet water stream from the bottom face to make the soil and stones at the bottom suspend in the water and reducing the resistance in a pipe and the friction.

CONSTITUTION: The opening of a vertical pipe 1 is made to vertically slide and positioned close to soil and stones 3 to suck them and pump up. In this case, the vertical suction pipe 1 is bent horizontally at the lower position than the critical point for suction of soil and stones 3 and in the lower part thereof, a valve of a collecting tank 2 of soil and stones is provided at the closed state. A fluid with a higher specific gravity containing soil and stones 3 is dropped on passing through a bend and only water continuously stored in the tank 2 is pumped up. Next, the valve is opened and the piled soil and stones are transferred to the upper side through another suction pipe 1'. The transfer pipe 4 is inclined and a jet water is elected from a water pipe 17. At the time, the inclined angle, the jet water pressure, and the water quantity are decided on the basis of conditions like kinds of soil and stones 3, the mixed ratio of water and soil and stones. In this way, soil and stones can be efficiently transferred by a small buoyant force.