PURPOSE: To very easily and quickly make a stone cut off a mountain, into a garden stone which looks as if it were naturally shaped in the flow or a river.

CONSTITUTION: Shafts 9 projecting from the centers of both the sides of a rotary drum 1 are supported on struts 8 set up on a base 7. Guide projections 10 are provided on the peripheries of both the sides of the drum 1 and revolvably supported on a plurality of rollers 11 provided on the base 7 at both the sides of the drum. A speed reducer 12 is installed between the rotary drum 1 and a motor 3 secured on one part of the base 7. The motor and the speed reducer are coupled to each other through a chain 13. The sped reducer 12 is also coupled through another chain 15 to a sprocket 14 fixed on a shaft 9 to rotate the drum 1 by the motor 3. Raw stones, pebbles and water are put into the rotary drum 1 through an opening 4. After the opening is closed, the drum is rotated to make the raw stones into garden stones.