To provide a manufacturing method of a synthetic resin-based thrust plate having usable plane accuracy without needing correction of a plane shape with hot plate pressing.SOLUTION: A manufacturing method of a thrust plate 1 manufactures a synthetic resin-based thrust plate with injection molding. The thrust plate 1 is formed into a hollow disc shape in which its thickness is within a range of 1-5 mm, and its outer diameter is more than 70 mm. For the injection molding, three or more gates 5 are provided at an equal interval in a circumferential direction of the thrust plate 1 on the thrust plate 1, and synthetic resin is charged via the respective gates 5.SELECTED DRAWING: Figure 2
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