Patent ID: 8177434

Claim:
A fluid dynamic bearing device, comprising: a housing opened at both ends; a bearing sleeve fixed to an inner periphery of the housing; a shaft member inserted into an inner periphery of the bearing sleeve; first and second flange parts formed on the shaft member and disposed on one side and the other side in an axial direction of the bearing sleeve, respectively; and a radial bearing clearance formed between an outer periphery of the shaft member and an inner periphery of the bearing sleeve, seal spaces being formed between an outer periphery of the first flange part and an inner periphery of the housing opposite thereto and between an outer periphery of the second flange part and an inner periphery of the housing opposite thereto, respectively, and oil surfaces of lubricating oil remaining in the seal spaces, wherein the housing is injection molded out of resin with the bearing sleeve as an insert, and two surfaces of the housing which form the seal spaces have an identical diameter.