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1. A method of manufacturing a spherical bearing comprising an inside member having a metal ball portion, and an outside member having a ball support portion enclosing and supporting the ball portion of the inside member and connected swingably or rotatably relative to the inside member, the method characterized by comprising the steps of:
performing injection molding, with the ball portion of the inside member being inserted into a mold as a core, to mold a resin liner covering the ball portion; casting the outside member covering the resin liner by inserting the ball portion and the resin liner into the mold as a core, such that the outside member is not in contact with the ball portion; and heating the resin liner covering the ball portion through only the ball portion of the inside member after the completion of the casting, wherein the ball portion of the inside member has a through-hole for fixing a member to be connected, and wherein said heating step includes inserting a coil into said through-hole, and applying a high-frequency voltage to the coil, and heating the ball portion of the inside member under a heating temperature of 1500 to 1600° C. for a heating time of 0.2 to 0.5 sec.
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