NOVELTY - A sealing sheet is provided with a sealing material sheet (11) arranged on light-receiving surface side, and sealing material sheet (12) arranged on back surface side. The storage elastic modulus (P1) of the sheet (11) at 120 degrees C before crosslinking process and the storage elastic modulus (P2) of sheet (12) at 120 degrees C before crosslinking process satisfy the relation: log (P1/P2) is more than 0, and is calculated by solid viscoelasticity measurement at measurement temperature of 25-180 degrees C, frequency of 1.0 Hz and temperature increase rate of 10 degrees C/minute.    USE - Solar cell sealing sheet used in solar cell module (claimed) for use in roofs of buildings.    ADVANTAGE - The sheet effectively suppresses the stress to a solar cell element and a wiring material, and generation of cracks, at the time of solar cell module manufacture, and provides solar cell module without influence of heat cycle.    DETAILED DESCRIPTION - A sealing sheet is provided with a sealing material sheet arranged on light-receiving surface side, and sealing material sheet arranged on back surface side. The storage elastic modulus (P1) of the sheet (11) at 120 degrees C before crosslinking process and the storage elastic modulus (P2) of sheet (12) at 120 degrees C before crosslinking process satisfy the relation: log (P1/P2) is more than 0, and is calculated by solid viscoelasticity measurement at measurement temperature of 25-180 degrees C, frequency of 1.0 Hz and temperature increase rate of 10 degrees C/minute. The sealing sheet is provided between light-receiving surface side protection component (14) and back surface side protection component (13) and seals the solar cell element (16) and wiring material (15).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a solar cell module.    Solar cell module (10)    Sealing material sheets (11,12)    Back surface side protection component (13)    Light-receiving surface side protection component (14)    Wiring material (15)    Solar cell element (16)