An inner space of a housing sealed with a seal member as well as internal pores
of a bearing member (pores in a porous structure) are filled with a lubricating
oil without the presence of air, so that the oil surface of the lubricating oil
is within a seal space. Under a reduced pressure of 100 Torr, no lubricating oil
leaks outside of the housing even at any attitude of the fluid lubricated bearing
device such as normal, inverted, or horizontal attitude.