To surely form a lubrication film by a liquid between a radial bearing and a thrust bearing, and to sustain cooling and lubrication well.

This pump device is composed by forming, in a shaft body 16, a slit-like passage 40 having one end opened by facing a suction port 3a side of an impeller 14, and the other end opened by facing a slide surface 41 between the radial bearing 15 and the thrust bearing 17.