To provide a formed article in which a pattern with plastic deformation of arbitrary intervals and phases is given to a strip material, and its design is improved.

A strip material 1 is formed by a method of the strip material 1 to be plastically formed with arbitrary intervals and phases by the command on the lengthwise displacement detected by a lengthwise displacement detector 4a by a plastically forming means synchronous with the feed speed of the strip material 1. The embossed or bent article with the pattern with intervals and phases in which the differential phase between the pattern and the cutting pitch is eliminated, and the pattern is diversified and arbitrary, can be obtained.