To prevent a depositing material from staying and accumulating in a check valve for suction and a check valve for discharge, even if transfer liquid containing a depositing material such as slurry and the like is used.
An axially retractable bellows 7 is provided in a pump body 1 so that it drivingly and retractably moves with its axial line B set vertical and forms a liquid compartment 9 on the inside of the bellows 7. A suction opening 18 and a discharge opening 19 are provided on the bottom surface 4a facing the liquid compartment 9 of the pump body 1. Liquid is sucked into the liquid compartment 9 from the suction opening 18 by the extensible movement of the bellows 7 and the liquid is discharged from the liquid compartment 9 from the discharge opening 19 by the contractible movement of the bellows 7. A ball type check valve 20 for suction provided in the suction opening 18 and a ball type check valve 21 for discharge provided in an outflow passage 6 in communication with the discharge opening 19 are provided with cylindrical valve casings 201, 220 with respective axial lines D, G vertically set, and a ball valve body 202, 221 in each valve casing 201, 220 is made to adhere to each valve seat 211 (213), 230 (232), in order to prevent a reverse flow.
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