Patent ID: 7556433

Claim:
A fluid dynamic bearing device comprising: a housing formed as a bottomed cylinder; a bearing sleeve retained in an inner periphery of the housing; a rotary member having a shaft portion inserted into the bearing sleeve and adapted to rotate around a rotation center axis; and a radial bearing portion supporting the rotary member in a radial direction in a non-contact support by a dynamic pressure action of a fluid generated in a radial bearing gap between the bearing sleeve and the shaft portion of the rotary member, wherein: the housing has a side portion formed in a substantially cylindrical configuration of a resin material by injection molding, a bottom member fixed to a fixing portion provided in an inner periphery of one axial end of the side portion and closing an opening at one axial end of the side portion, and a gate cut portion facing a chamfered portion in the radial direction, the gate cut portion being covered with an adhesive and is provided on an inner peripheral edge portion at another axial end of the side portion; and each of a first surface in the fixing portion, which is in contact with an outer peripheral surface of the bottom member, and a second surface in the fixing portion, which is in contact with an axial end surface of the bottom member, is a molding surface.