NOVELTY - An all-solid-state secondary battery (10) comprises a nitrogen-containing polymer and inorganic solid electrolyte having conductivity for metal ions of group I or group II of periodic table, in a positive electrode active material layer (4), a negative electrode active material layer (2) and/or a solid electrolyte layer (3). The nitrogen-containing polymer has a repeating unit containing substituents (X), (Y') and/or (Z). The substituent (X) is functional group having pKa of 14 or less. The substituent (Y') is group having polymer chain containing a hetero atom.    USE - All-solid-state secondary battery. Uses include but are not limited to notebook personal computer, mobile personal computer, mobile telephone, portable printer, headphones stereo, liquid crystal television, electric shaver, transceiver, electronic organizer, calculator, memory card, portable tape recorder, electric vehicle, game machine device, etc.    ADVANTAGE - The all-solid-state secondary battery has high ionic conductivity and bending durability.    DETAILED DESCRIPTION - An all-solid-state secondary battery comprises a nitrogen-containing polymer and inorganic solid electrolyte having conductivity for metal ions of group I or group II of periodic table, in a positive electrode active material layer (4), a negative electrode active material layer (2) and/or a solid electrolyte layer. The nitrogen-containing polymer has a repeating unit containing substituents (X), (Y') and/or (Z). The substituent (X) is functional group having pKa of 14 or less. The substituent (Y') is group having polymer chain containing a hetero atom, and optionally has connection chain, which connects with another nitrogen-containing polymer molecule. The substituent (Z) is group having hydrogen atom coupling with nitrogen atom to form -NH- group, group having 1-30C alkyl group, group having 1-30C haloalkyl or silicone chain having 1-100 silicon atoms. INDEPENDENT CLAIMS are included for the following:    (1) solid electrolyte composition containing the binder and inorganic solid electrolyte;    (2) battery electrode sheet, which is formed by processing the solid electrolyte composition into a film on metal foil;    (3) manufacture of battery electrode sheet; and    (4) manufacture of all-solid-state secondary battery.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of all-solid-state secondary battery.    Anode collector (1)    Negative electrode active material layer (2)    Inorganic solid electrolyte layer (3)    Positive electrode active material layer (4)    Positive electrode electrical power collector (5)    All-solid-state secondary battery (10)