MEMBER INTEGRATED WITH SLEEVE, AND METHOD FOR MANUFACTURING SAME

A protrusion (30) is formed so as to rise from a base plate (W), and the protrusion (30) is formed into a spacer (12) having predetermined outer diameter (D) and height (H). In forming the spacer (12), first the protrusion (30) is shaped to have a diameter greater than the predetermined outer diameter (D) and then shaped to have a height greater than the predetermined height (H) . After that, the protrusion (30) is pressed and crushed to cause the top (30b) of the protrusion (30) to protrude outward in the radial direction and have a two-ply structure, and a through-hole (35) is formed in the top (30b) . The configuration provides the top (30b) with strength provided by the double-layer structure. Also, a side section (30a) has high strength due to the pressing and compression. A member integrated with a sleeve is provided with the spacer (12), and the entire spacer (12) has sufficient strength.