Provided are a solid electrolyte composition including an inorganic solid electrolyte (A) having conductivity of an ion of a metal belonging to Group I or II of a periodic table, a dispersion medium (B) having a Log P value of 1.2 or less, and a dispersion medium (C) having a Log P value of 2 or more, in which a mass ratio (C)/(B) of the dispersion medium (C) to the dispersion medium (B) is 100,000≥(C)/(B)≥10, a solid electrolyte-containing sheet, an all-solid state secondary battery, and methods for manufacturing a solid electrolyte-containing sheet and an all-solid state secondary battery.
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