The subject innovation relates to a vacuum water pumps used to pump the water, to a water meter and to occur during the drive of the vacuum smooth wishes to provide an effective can be performed, significantly improving the carrying capacity of the vacuum pumping water meter. That is, the present design is in the vacuum water meter (1) for pumping a fluid, low-Susilo (6) inside the body (5) having a shaft portion (4) for supporting the pulley (2) coupling the drive shaft (3) the so formed sealed with a cover (7), and that Susilo 6 in is formed in the discharge port (8a) for discharging the water to a low Susilo 6, the shaft portion 4 side suction pipe 11 to the upper side is be in communication with the suction chamber (9), which is the pipe shaft (3), the outer edge portion and bonded to suction port (8b), the pumping chamber (8) the impeller (10) provided separately from the one forming the low-Susilo 6 upwardly the exhaust hole 13 is formed, with the outside by the suction hole 14 is formed, and the discharge pipe 15 in the upper side adjacent to the exhaust hole 13 of the cover 7 is bonded screw casing for discharging the water ( 16) a forms a pressurizing chamber (17) therein to combine driving the discharge hole 13 and the suction hole 14 is made through to feed cover 18, and the pressure chamber 17, the impeller 10 by extending the drive shaft (3) to the discharge pipe (1 5) hassle side by fixing the screw 19 for pressing the transfer the water shaft, for performing a pumping chamber 8 low Susilo 6 always separate vacuum processing upon re operation to maintain a state where the water filled in the containing be solved by a can be made a quick restart, the maximum discharge pressure by a discharge pipe (15) screw (19) within the pressure chamber 17 when the water discharged to the (ⅱ).