NOVELTY - A solar cell-sealing material comprises ethylene- alpha -olefin copolymer having Shore A hardness of 60-85, based on ASTM D2240, and melt flow rate of 2.16 kg load of 2-50g/10 minutes, under conditions of 190 degrees C, based on ASTM D1238, and peroxyketal (I) having half-life temperature of 100-135?Oc for 1 hour. The content of peroxyketal with respect to 100 parts weight of ethylene- alpha -olefin copolymer is 0.1-0.8 parts weight.    USE - Sealing material is used for solar cell module (claimed) for outdoor, roof of building and motor vehicle.    ADVANTAGE - The sealing material has excellent transparency, flexibility, adhesivenss, heat resistance, and electrical property. The solar cell module formed using the sealing material has excellent weather resistance, moisture permeability, light transmittance, scratch resistance, shock absorption property, durability, high productivity, and suppresses the generation of swelling, and is economical.    DETAILED DESCRIPTION - A solar cell-sealing material comprises ethylene- alpha -olefin copolymer having Shore A hardness of 60-85, based on ASTM D2240, and melt flow rate of 2.16 kg load of 2-50g/10 minutes, under conditions of 190 degrees C, based on ASTM D1238, and peroxyketal of formula: R1-O-O-C(-R2)(-R3)-O-O-R1 (I) having half-life temperature of 100-135 degrees C for 1 hour. The content of peroxyketal with respect to 100 parts weight of ethylene- alpha -olefin copolymer is 0.1-0.8 parts weight.    R1=3-8C linear or branched alkyl;    R2,R3=1-8C linear or branched alkyl;and    R2+R3=5-9C aliphatic ring (optionally substituted with alkyl).    INDEPENDENT CLAIMS are included for the following:    (1) manufacture of sealing material, which involves molding resin composition containing ethylene- alpha -olefin copolymer and peroxyketal, melt-extruding to film; and    (2) solar cell module (20), which consists of surface-protection material (24), back surface-protection material (26), solar cell element and sealing layer (28) obtained by crosslinking solar cell-sealing material, which seals the solar cell element.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of solar cell module.    Solar cell module (20)    Photovoltaic cell (22)    Surface-protection material (24)    Back surface protection material (26)    Sealing layer (28)