NOVELTY - A silicon gel composition comprises 100 parts mass organopolysiloxane (A) (I) having silicon atom-bonded alkenyl group in molecule, an organohydrogen polysiloxane (B) (II) having at least two silicon hydride groups per molecule and used in amount at which content of silicon hydride groups is 0.8-3 mol per mol of silicon atom-bonded alkenyl groups in component (A), and platinum catalyst (C), and has chlorine content of 2 ppm or less, determined by neutralization titration according to the oxygen flask combustion method with respect to total amount of components (A-C).    USE - Silicon gel composition is used for sealing photovoltaic cell of solar cell module (claimed), and vehicle-mounted electronic component.    ADVANTAGE - The silicon gel composition provides cured material with excellent discoloration resistance and light transmittance. The solar cell module containing the cured material has improved efficiency and high reliability.    DETAILED DESCRIPTION - A silicon gel composition comprises 100 parts mass organopolysiloxane (A) of formula (I) having at least one silicon atom-bonded alkenyl group in molecule, organohydrogen polysiloxane (B) of formula (II) having at least two siliocon hydride (SiH) groups per molecule and used in amount at which the content of silicon hydride (SiH) groups is 0.8-3 mol per mole of silicon atom-bonded alkenyl groups in component (A), and platinum catalyst (C) in catalytic quantity of 0.1-10 ppm with respect to total amount of components (A, B), and has chlorine content of 2 ppm or less, determined by neutralization titration according to the oxygen flask combustion method with respect to the total amount of components (A-C).    R1=2-8C alkenyl;    R2=1-10C monovalent hydrocarbyl which does not contain aliphatic unsaturated bonds;    a,b=0-3;    a+b=4;    c=0-3;    d=0-2;and    c+d=0-4.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of structure of solar cell module.    Panel (1a, 1b)    Silicon gel cured film (2a, 2b)    Sealing component (3)    Photovoltaic cell (4)    Frame component (5)