NOVELTY - A solid electrolyte composition comprises inorganic solid electrolyte having conductivity of ions of group 1 or group 2 metal in periodic table and compound (a) having two or more polymerizable functional groups. At least one of the polymerizable functional groups is a functional group having sulfur atom or cyclic functional group having oxygen atom.    USE - Solid electrolyte composition is used for manufacture of battery electrode sheet for manufacture of all-solid-state secondary battery (all claimed) e.g. all-solid-state lithium-ion secondary battery. Uses include but are not limited to motor vehicle, electric vehicle, game machine device, timepiece, medical device, electronic organizer, calculator, portable printer, mobile telephone, notebook personal computer, etc.    ADVANTAGE - The all-solid-state secondary battery provided with battery electrode sheet manufactured using the solid electrolyte composition has high capacity and excellent electrode flexibility, and is safe.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) battery electrode sheet, which is formed by forming the solid electrolyte composition into a film on metal foil;    (2) all-solid-state secondary battery (10), which comprises positive electrode active material layer (4), negative electrode active material layer (2) and solid electrolyte layer (3), in which at least one of positive electrode active material layer, negative electrode active material layer and solid electrolyte layer contains solid electrolyte composition; and    (3) manufacture of battery electrode sheet, which involves arranging positions the solid electrolyte composition on metal foil, and forming the solid electrolyte composition into a film.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional schematic view of the all-solid-state lithium-ion secondary battery.    Anode collector (1)    Negative electrode active material layer (2)    Solid electrolyte layer (3)    Positive electrode active material layer (4)    All-solid-state secondary battery (10)