To promote the lubrication of a sliding surface of a mechanical seal by shortening the length of a centrifugal multi-stage pump.

This pump is provided with a guide vane 8 for guiding the liquid discharged from the final stage impeller 3, a discharge liquid chamber 11 for surrounding outside of the guide vane 8, a shaft seal device 12 provided at the center of the discharge liquid chamber 11, a guide passage 8a for guiding the liquid discharged from the impeller 3 to the centrifugal direction, a leg part 8d to be engaged with a chamber wall 11a of the discharge liquid chamber 11 so as to hold it for positioning, and a resistant vane for regulating the circumferential rotation of the liquid inside of the discharge liquid chamber 11 so as to generate a liquid flow passing through the center of the discharge liquid chamber 11. With this structure, most of the liquid guided by the guide passage 8a is discharged from a discharge port 5a provided in the periphery of the discharge liquid chamber 11 without directing the center of the discharge liquid chamber 11.