To provide a method for working a trunnion of a toroidal continuously variable transmission by which the working time is shortened and the working cost is reduced.

In the method for working the trunnion of the toroidal continuously variable transmission, the trunion freely rotatably supporting a power roller which is freely tiltably in roll contact with an input disk and an output disk, parts 25a-25c to be worked of an outer circumferential part 24 of a back side of the trunnion 21 are subjected to the cold plastic working (coining or sizing), and the plastically worked face forms a reference surface in working the trunnion.