PURPOSE: To efficiently transfer slurry by composing a slurry pump of a storage chamber, transfer cylinders, transfer pistons, a drive pipe, transfer pipes and so on.

CONSTITUTION: Since pressure oil which is discharged from the front end of one cylinder chamber 12 is fed to the front end of the other cylinder chamber 12, one piston rod 14 forcibly advances while the other one 14 is retracted. A slurry inside one transfer cylinder 24 is thereby discharged by the other transfer piston 25 into a drive pipe 38 and transferred rearward in a transfer pipe 36. By retracting the other piston rod 14, the slurry inside a storage chamber 7 is sucked into the other transfer cylinder 24.