NOVELTY - An ethylene vinyl acetate copolymer composition contains an ethylene vinyl acetate copolymer, a silane coupling agent oligomer and a crosslinking agent obtained from an organic peroxide. The oligomer is obtained by hydrolyzing and condensing 3-methacryloxypropyl trimethoxysilane. The absorption ratio of methoxy group with respect to absorption of vinyl group is 0.05 or less in infrared absorption spectrum. The absorption ratio of silanol group resulting from silane coupling agent oligomer with respect to absorption of vinyl group is 0.4 or more in infrared absorption spectrum.    USE - Ethylene vinyl acetate copolymer composition is used for glass adhesive sheet for solar cell module (all claimed).    ADVANTAGE - The glass adhesive sheet formed using the ethylene vinyl acetate copolymer composition has improved adhesiveness with respect to glass plate. The crosslinking characteristics of the composition are maintained even when composition is stored for long period of time. The solar cell module formed using the adhesive sheet has high durability and electric power generation characteristics.    DETAILED DESCRIPTION - An ethylene vinyl acetate copolymer composition contains an ethylene vinyl acetate copolymer, a silane coupling agent oligomer and a crosslinking agent obtained from an organic peroxide. The amount of silane coupling agent oligomer with respect to 100 parts mass of ethylene vinyl acetate copolymer is 0.05-10 parts mass. The silane coupling agent oligomer is obtained by hydrolyzing and condensing 3-methacryloxypropyl trimethoxysilane. The absorption ratio of methoxy group with respect to absorption of vinyl group is 0.05 or less in infrared absorption spectrum. The absorption ratio of silanol group resulting from silane coupling agent oligomer with respect to absorption of vinyl group is 0.4 or more in infrared absorption spectrum. An INDEPENDENT CLAIM is included for solar cell module (10), which has a photovoltaic cell (11) clamped between pair of sealing materials (12). The sealing material is a glass adhesive sheet formed using the ethylene vinyl acetate copolymer composition.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of solar cell module.    Solar cell module (10)    Photovoltaic cell (11)    Sealing material (12)    Glass plate (13)    Back sheet (14)