The present invention provides a RFID device arranged on an object surface, comprising a substrate, a first metal layer and a second metal layer. The first metal layer has a first connecting surface having a first adhering layer for adhering to the first surface of the substrate, wherein a RFID element is electrically connected to the first metal layer and a length of the first metal layer is larger than a length of the substrate such that the first metal layer has a first extending part extending outwardly from the lateral surface of the substrate. The second metal layer has a second connecting surface having a second adhering layer formed thereon for adhering the second metal layer on the second surface, wherein the first extending metal layer is attached onto but electrically insulated from the object surface or the second metal layer.