To provide a pressurizing centrifugal pump allowed to set both a flow rate and flow pressure high as requested, manufactuable with simple and low-cost constitution and miniaturizable.

This pressurizing centrifugal pump 1 is so constituted that an impeller 3 with a plurality of blades 31 radially formed, is rotated in a drum-like case 2 having a suction port 20 and a delivery port 21, to suck a fluid from the suction port 20 and to deliver the fluid from the delivery port 21. In this case, a partition wall 60 is installed at the center part of the impeller 3 in the case 2, and a pressure chamber 6 communicating with the suction port 20 and the delivery port 21 through the impeller 3 is provided around the partition wall 60. The pressure chamber 6 is formed of a suction chamber 61 for accelerating the suction of the fluid from the suction port 20 side, and a compression chamber 62 communicating with the suction chamber 61 and pressurizing the fluid.