A hydrodynamic pressure bearing type pump includes a main body having a
fluid flow inlet formed at one end portion thereof and a fluid flow
outlet formed at the other end portion thereof and a rotating portion
disposed within a fluid flow passage of the fluid within the main body to
generate hydrodynamic pressure to let the fluid flow into the fluid flow
inlet and to let the fluid flow from the fluid flow outlet to the
outside. The rotating portion includes a shaft, a hydrodynamic pressure
bearing for generating hydrodynamic pressure to let the fluid flow into
the fluid flow inlet and to let the fluid flow from the fluid flow outlet
to the outside when the shaft is rotated and a rotation force generating
portion disposed within the main body to generate rotation force for
rotating the shaft when it is energized.