FLUID DYNAMIC BEARING DEVICE

A fluid dynamic bearing device 1 comprising: a shaft member 2; a bearing sleeve 8 having the shaft member 2 inserted into the inner circumference thereof; a floored cylindrical housing 7 holding the bearing sleeve 8 in the inner circumference thereof and having an opening in an end section on one side in the axial direction; and a seal member 9 provided in the opening of the housing 7. The seal member 9 has: a disc 9a arranged on one side of the bearing sleeve 8 in the axial direction; and a protruding section (tubular section 9b) protruding to the other side in the axial direction, from an outer radial end of the disc 9a. An outer circumferential surface 9c of the seal member 9 is fixed to an inner circumferential surface 7a1 of the housing 7. 流体动压轴承装置(1)具备：轴构件(2)；轴承套筒(8)，其在内周插入有轴构件(2)；有底筒状的壳体(7)，其在内周保持轴承套筒(8)，并在轴向一侧的端部具有开口部；以及密封构件(9)，其设置于壳体(7)的开口部。密封构件(9)具有：圆盘部(9a)，其配置于轴承套筒(8)的轴向一侧；以及凸部(圆筒部(9b))，其从圆盘部(9a)的外径端向轴向另一侧突出。将密封构件(9)的外周面(9c)固定于壳体(7)的内周面(7a1)。