To easily obtain a safe expand metal without forming an acute edge by rolling the expand metal formed with an expanding process from the reverse direction to the transferring direction and making it into a specific wall thickness.

An expand metal 10 produced via a cutting and expanding processes is inserted between a pair of rolling rollers 40, 40 from the reverse direction to the transferring direction. Rolling is executed from the reverse direction to the transferring direction. The degree of rolling is executed with rolling so that the wall thickness of the expand metal 10 after rolling is made, at least, as about 60 to 70% against the wall thickness of a metal sheet as a raw material. The expand metal 10 obtained on this process is not formed with an acute edge on any part of a connecting part or a connection crossing part and can be used for a place of existing a chance to directly touch to human fingers, etc.