BINDER FOR ALL-SOLID-STATE SECONDARY BATTERY, INORGANIC SOLID ELECTROLYTE-CONTAINING COMPOSITION, SHEET FOR ALL-SOLID-STATE SECONDARY BATTERY, AND ALL-SOLID-STATE SECONDARY BATTERY

Provided are a binder for an all-solid-state secondary battery, which contains a polymer represented by Formula (I) and having an acid value of 3 mgKOH/g or less; an inorganic solid electrolyte-containing composition containing the binder, an inorganic solid electrolyte, and a dispersion medium; and a sheet for an all-solid-state secondary battery and an all-solid-state secondary battery using the composition. In Formula (I), Rrepresents an (m+n)-valent linking group, Arepresents a hydrogen atom, or a functional group or a polymer chain, including at least one amide substituent, Arepresents a functional group or a polymer chain, including at least one of a fluorine atom or a polysiloxane structure, n represents an integer of 1 to 8, and m represents an integer of 1 to 9, where m+n represents an integer of 2 to 10.