Abstract: A pump includes a pump unit having an impeller for sucking and/or discharging liquid; a motor unit for driving the pump unit; a case for accommodating the pump unit; a partition plate for isolating the motor unit from the pump unit; and a mold resin integrally formed with the motor unit to protect the motor unit. Further, a bottom portion of a cylindrical portion projecting from the partition plate to the motor unit has a liquid-free surface having a convex spherical shape. Moreover, a method of manufacturing a pump, the method includes the steps of installing a partition plate at a lower half; installing a stator and a controlling part at the partition plate; closing the lower half with an upper half; curing resin after filling the resin into a cavity formed between the lower and the upper half; opening a mold; and extracting a molded motor product.