To provide a method for bending a nano-material for achieving a bending process on a wire or sheet type nano-material while responding to requirements of creating a functional microstructure made of a nano-material, and to provide an actuator made of a nano-material using the method.

A different material 2 having a coefficient of linear expansion different from that of a nano-wire 1 is formed on the surface of the nano-wire 1 at a process temperature different from the use temperature after the process. The cross section after the formation has an asymmetry arrangement of the different material 2 so as to induce bending moment in the cross section by the thermal stress generated by the temperature difference between the process temperature and the use temperature. When temperature is changed from the process temperature to the use temperature, bend deformation is caused by the bending moment, and thereby, a bend process is achieved. By changing the use temperature of the nano material after the process, the radius of curvature in bending deformation can be changed according to the same principle as above described, and thereby, an ultra-micro actuator can be obtained.