PUMP UNIT

PROBLEM TO BE SOLVED: To provide a pump unit having substantially the same opening and a volume discharge ratio as a straight pipe unit, and capable of discharging fluid flowing into a pump in a direction different from a flowing in direction.SOLUTION: A pump unit has an outer pipe, an inner pipe comprising a rubber member arranged in the inner peripheral side of the outer pipe, a fixing member for fixing both axial directional end parts of the inner pipe to both axial directional end parts of the outer pipe, and a passage for pressurizing for supplying pressurizing medium between the inner pipe and the outer pipe and discharges fluid flowing in from one side of the inner pipe in an axial direction from the other side by expanding the inner pipe by the pressure of the pressurizing medium, and is constituted such that the inner pipe has a cylindrical part having a rectangular shape in a longitudinal cross-section and an oblique face part having a right triangle shape in a longitudinal cross-section passing through an axial line of the inner pipe and when cutting in a face parallel or to the axial line of the inner pipe.