Patent ID: 8556510

Claim:
A rotating apparatus comprising: a base plate; a hub having an opening in a center wherein a recording disk is to be placed on an outer circumference of the hub; and a bearing unit configured to rotatably support the hub relative to the base plate, the bearing unit including: an outer sleeve joined to an inner circumference of the opening; an inner sleeve joined to an inner circumference of the outer sleeve; a shaft housed in the inner sleeve wherein one end of the shaft is jointed to the base plate; a radial dynamic pressure groove provided on at least one of an inner circumferential surface of the inner sleeve and an outer circumferential surface of the shaft; and a lubricant agent present in between the inner circumferential surface of the inner sleeve and the outer circumferential surface of the shaft, wherein in a joined portion of the outer sleeve and the hub, there are formed a binding region where the outer sleeve and the hub are joined together with a hardening resin present therebetween and a raised region, provided on both sides of the binding region in an axial direction of the outer sleeve, which forms a portion narrower than a gap, between the outer sleeve and the hub, corresponding to the binding region.