A dynamic pressure bearing is provided in which required performances such as corrosion resistance and wear resistance in the use of a hard disk drive or the like are realized without application of any coating such as Ni plating that easily causes a failure, thereby exhibiting stable performances for a long time with a high production yield. As solving means for the above, the material of a sleeve is set to a copper alloy which contains a brass composed essentially of copper (Cu) and zinc (Zn), and silicon (Si), and which does not contain a low-melting soft metal component. A hard phase consisting of a compound of brass and silicon, and a soft phase consisting of brass are mixedly present in a matrix form. According to the configuration, the free-cutting property, the wear resistance, and the corrosion resistance are improved, and a coating by hard Ni plating or the like is not required. Since a low-melting soft metal component is not contained, a working fluid is prevented from being deteriorated.