A fluid dynamic bearing device, comprising: a bearing member on a rotary side, the bearing member being made of a porous material and having end surfaces (22b, 22c) on both sides in an axial direction; a housing on a stationary side, the housing having a bottomed cylindrical shape closed on one side in the axial direction and being configured to receive the bearing member on an inner periphery of the housing; a sealing member arranged so as to face the end surface of the bearing member on another side in the axial direction and configured to open the another side of the bearing member in the axial direction to atmosphere through a sealing gap; a radial bearing gap to be formed between an outer peripheral surface of the bearing member and an inner peripheral surface (7a2) of the housing; and a thrust bearing gap to be formed between the end surface of the bearing member on one side in the axial direction and an inner bottom surface (7b1) of the housing, the radial bearing gap and the thrust bearing gap being filled with lubricating oil, the bearing member being supported respectively in a radial direction and a thrust direction by an oil film to be formed in the radial bearing gap and an oil film to be formed in the thrust bearing gap, the fluid dynamic bearing device having an axial gap containing air, the axial gap being formed between the end surface of the bearing member on the another side in the axial direction and an end surface of the sealing member, which faces the end surface of the bearing member on the another side in the axial direction, wherein the bearing member is supportable in another thrust direction by an external force forcing the bearing member to the one side in the axial direction. a bearing member on a rotary side, the bearing member being made of a porous material and having end surfaces (22b, 22c) on both sides in an axial direction; a housing on a stationary side, the housing having a bottomed cylindrical shape closed on one side in the axial direction and being configured to receive the bearing member on an inner periphery of the housing; a sealing member arranged so as to face the end surface of the bearing member on another side in the axial direction and configured to open the another side of the bearing member in the axial direction to atmosphere through a sealing gap; a radial bearing gap to be formed between an outer peripheral surface of the bearing member and an inner peripheral surface (7a2) of the housing; and a thrust bearing gap to be formed between the end surface of the bearing member on one side in the axial direction and an inner bottom surface (7b1) of the housing, the radial bearing gap and the thrust bearing gap being filled with lubricating oil, the bearing member being supported respectively in a radial direction and a thrust direction by an oil film to be formed in the radial bearing gap and an oil film to be formed in the thrust bearing gap, the fluid dynamic bearing device having an axial gap containing air, the axial gap being formed between the end surface of the bearing member on the another side in the axial direction and an end surface of the sealing member, which faces the end surface of the bearing member on the another side in the axial direction, wherein the bearing member is supportable in another thrust direction by an external force forcing the bearing member to the one side in the axial direction.