A fluid dynamic bearing device, comprising: a stationary body; a rotary body configured to rotate relative to the stationary body; a sleeve portion made of a sintered metal provided to the stationary body or the rotary body, the sleeve portion having end surfaces (22b, 22c) on both sides in an axial direction of the sleeve portion; a radial bearing gap formed by an outer peripheral surface of the sleeve portion; a thrust bearing gap formed by the end surface of the sleeve portion on one side in the axial direction of the sleeve portion; lubricating oil for filling internal pores of the sleeve portion, the radial bearing gap, and the thrust bearing gap; and a thrust dynamic pressure generating portion, wherein: the oil permeability is set to 15% or smaller, and the lubricating oil present in the thrust bearing gap is caused to flow along the thrust dynamic pressure generating portion along with a rotation of the rotary body, to thereby cause a dynamic pressure generating action in the lubricating oil present in the thrust bearing gap, resulting in supporting the rotary body in a non-contact manner in one thrust direction; and a percentage of a value calculated by dividing the oil permeability of the sleeve portion by a mass flow rate of the lubricating oil flowing along the thrust dynamic pressure generating portion during the rotation of the rotary body is 4% or larger. a stationary body; a rotary body configured to rotate relative to the stationary body; a sleeve portion made of a sintered metal provided to the stationary body or the rotary body, the sleeve portion having end surfaces (22b, 22c) on both sides in an axial direction of the sleeve portion; a radial bearing gap formed by an outer peripheral surface of the sleeve portion; a thrust bearing gap formed by the end surface of the sleeve portion on one side in the axial direction of the sleeve portion; lubricating oil for filling internal pores of the sleeve portion, the radial bearing gap, and the thrust bearing gap; and a thrust dynamic pressure generating portion, wherein: the oil permeability is set to 15% or smaller, and the lubricating oil present in the thrust bearing gap is caused to flow along the thrust dynamic pressure generating portion along with a rotation of the rotary body, to thereby cause a dynamic pressure generating action in the lubricating oil present in the thrust bearing gap, resulting in supporting the rotary body in a non-contact manner in one thrust direction; and a percentage of a value calculated by dividing the oil permeability of the sleeve portion by a mass flow rate of the lubricating oil flowing along the thrust dynamic pressure generating portion during the rotation of the rotary body is 4% or larger. the oil permeability is set to 15% or smaller, and the lubricating oil present in the thrust bearing gap is caused to flow along the thrust dynamic pressure generating portion along with a rotation of the rotary body, to thereby cause a dynamic pressure generating action in the lubricating oil present in the thrust bearing gap, resulting in supporting the rotary body in a non-contact manner in one thrust direction; and a percentage of a value calculated by dividing the oil permeability of the sleeve portion by a mass flow rate of the lubricating oil flowing along the thrust dynamic pressure generating portion during the rotation of the rotary body is 4% or larger.