NOVELTY - The element has a primary metallic foil (304) formed on a substrate (302). An insulating layer abutting on the primary metallic foil is formed on the substrate. A secondary metallic foil (306) is formed on the primary metallic foil such that optical energy applied from external sources to the primary and secondary metallic foils are converted into electric power. The primary and secondary metallic foils are non-magnetic metal thin films or Mu-Metal (RTM: nickel-iron alloy) thin films. A resistance value of the primary metallic foil is smaller than that of the secondary metallic foil.    USE - Double-layer metal thin film type electric power generating element for integrated electric power generator in a small electronic instrument, a home and an official electronic device.    ADVANTAGE - The primary and secondary metallic foils have different Seebeck coefficient, and the applied optical energy and heat energy are converted into electric power. The element is small in size, and occupies less space, so that the element can be manufactured in a simple manner and scope of application of the element is improved, thus avoiding limit about miniaturization due to material property and characteristic of the element. The element streamlines sputtering process without patterning process, so that manufacturing cost of the element can be sharply reduced, and mass production can be realized in an inexpensive manner. The element utilizes optical energy of the sun, fluorescent lamp, incandescent lamp, LED light and heat energy generated in an electronic device, so that the element is environment-friendly and multifunctional.    DETAILED DESCRIPTION - The substrate is an n-type silicon substrate or p-type silicon substrate. An INDEPENDENT CLAIM is also included for an integrated electric power generator.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a double-layer metal thin film type electric power generating element.    Substrate (302)    Primary metallic foil (304)    Secondary metallic foil (306)