Fluid dynamic bearing device and method of manufacturing the same

A fluid dynamic bearing device, comprising:

• a bearing sleeve having a radial bearing surface;
• a housing having an inner periphery along which the bearing sleeve is fixed;
• a shaft member inserted along an inner periphery of the bearing sleeve;
• a protruding part provided while protruding to an outer diameter side of the shaft member so as to be arranged at each end of the bearing sleeve;
• a radial bearing gap formed between the radial bearing surface of the bearing sleeve and an outer peripheral surface of the shaft member;
• and
• a thrust bearing gap, the shaft member being supported in a non-contact manner with use of a dynamic pressure effect of lubricant fluid generated in both the bearing gaps,
• wherein the housing has
• a small diameter inner peripheral surface as a fixing part of the bearing sleeve,
• a large diameter inner peripheral surface positioned on an outer diameter side of the protruding part, and
• a step surface connecting the small diameter inner peripheral surface and the large diameter inner peripheral surface, the step surface being provided with a thrust bearing surface in which the thrust bearing gap is formed.