A fluid bearing device capable of preventing a lubricant from scattering outward even during rotation thereof, while holding a relatively large amount of lubricant at a seal surface portion. A lubricant is filled between a sleeve and a shaft, a seal surface portion is formed on the sleeve in a location facing an open end thereof, the seal surface portion has a sectional shape defined by a plurality of inclined surfaces, and an inclination angle .alpha. of the inclined surface of the seal surface portion adjacent a radial bearing portion with respect to a shaft axis is formed to be larger than an inclination angle .beta. of the inclined surface of the seal surface portion distant away from the radial bearing portion with respect to the shaft axis.