A touch sensor having a visible area and a peripheral area on at least one side of the visible area includes a substrate, a metal nanowire layer, and a metal layer. The metal nanowire layer is disposed on the substrate and has a first portion corresponding to the visible area and a second portion corresponding to the peripheral area. The metal layer is disposed on the substrate and corresponding to the peripheral area, in which a portion of the metal layer overlaps and contacts at least a portion of the second portion of the metal nanowire layer, such that an overlapping region is formed, a contact area of the overlapping region is between 0.09 mm2 and 1.20 mm2, and a contact impedance of the overlapping region is less than 50Ω.