A fluid dynamic bearing has pressure-generating grooves provided in opposed thrust surfaces of a thrust bearing portion opposite a circular plate and a stopper to direct a working fluid from inner and outer peripheral edges of the thrust bearing portion toward a radially intermediate portion thereof as a shaft member rotates relative to a support. One or more through-holes are provided between inner edges of annular regions of the thrust surfaces in which the pressure-generating grooves are provided and the intermediate portion in the radial direction. The through-holes extend through the thrust bearing portion and interconnect pressure-generating grooves in the opposed thrust surfaces so that bubbles in the working fluid can be sucked smoothly into the through-holes through the pressure-generating grooves.