NOVELTY - The function transferring object (14) has a carrier (10) with a rugged nanostructure (11). A functional layer (12) is provided in the rugged nanostructure. The functional layer is transferred to an object (20) to be processed by contacting functional layer with a main surface of the object and removing the carrier from functional layer. The mean pitch of the rugged nanostructure is 1 nm to 1500 nm. The ratio of surface roughness of exposed surface of functional layer to the distance between top of protrusions of rugged structure and exposed surface of functional layer is less than or equal to 1.2.    USE - Function transferring object for micro substance detection sensor, nano reaction zone, reflection preventing surface, highly efficient semiconductor light-emitting device, quantum dot device, photonic crystal device, ornament using optical-diffraction color, ornament using photonic band gap, adhesive sheet of optical waveguide, nano circuit, nano dielectric antenna, super hydrophobic surface, super hydrophilic surface, highly efficient photo catalyst surface, water collection surface, anti icing and snow-protection surface, adsorption agent, adhesive and fuel cell.    ADVANTAGE - The function can be transferred to an object to be processed with high precision at an optimal place using a function transferring object. The physical stability of a function transferring object can be improved even when function transferring object is conveyed to the place suitable for use of object. The structural destruction of a functional layer can be suppressed since the adhesion surface area and the adhesive force of a functional layer and object are larger. Hence, the transferability of function can be improved.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a method for transferring functional layer; and    (2) a function transferring film roll.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view illustrating a method for providing a function to an object.    Carrier (10)    Rugged nanostructure (11)    Functional layer (12)    Function transferring object (14)    Object to be processed (20)