NOVELTY - The method involves making the electrodes (101A,101B) containing a metal to contact on the surface of the sheet shaped resin material (100) by laminating the electrodes on the side of the resin material. The metal is moved in the inside of the resin material toward the other electrode by applying the voltage between electrodes from electrode. The long-term reliability of the resin material is evaluated based on a time-dependent change of the hue and volume resistivity characteristic of the resin material. The electrodes are formed on insulation base material.    USE - Method for evaluating long-term reliability of resin material used for solar cell sealing material for manufacturing solar cell module (all claimed) installed in roof of building.    ADVANTAGE - The long-term reliability of resin material can be evaluated simply with high-precision. The electric power generation efficiency of solar cell module can be improved. The excellent long-term reliability of solar cell module can be obtained. The metal migration can be made faster, when the applied voltage is increased.    DETAILED DESCRIPTION - The resin material is selected from glass, a ceramic, and a polymeric material. The base materials are provided on the sides of the resin material. The metal is selected from the group of silver, copper, aluminum, and tin. INDEPENDENT CLAIMS are included for the following:    (1) The method for manufacturing solar cell module, involves selecting the resin material using the long-term reliability evaluation method. The solar cell sealing material is molded using the resin material. The surface-side transparent protection element, the solar cell sealing material, the solar cell element, and a back surface side protection element are laminated to form a laminated component. The laminated component is pressurized, heated and integrated; and    (2) the solar cell sealing material has a sheet having a thickness of 0.5 mm is provided with the sealing material on the white-board glass in which the silver electrodes having an inter electrode distance of 0.2 mm, is laminated. The volume resistivities of the sheet are set, when the voltage of 10 V is applied in 85 degrees C and an 85 % RH environment between the electrodes of the silver electrodes. The ratio between the volume resistivities of the sheet is set to preset range.    DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory view illustrating the long-term reliability evaluation process of resin material.    Resin material (100)    Electrodes (101A,101B)