Provided is a sulfide-based solid-state battery which has high charge/discharge capacity especially for charging/discharging under high current density conditions. A sulfide-based solid-state battery which is provided with a positive electrode, a negative electrode and a sulfide-based solid electrolyte layer that is interposed between the positive electrode and the negative electrode. The sulfide-based solid-state battery is characterized in that: the negative electrode is provided with at least a negative electrode active material layer; the negative electrode active material layer contains fine negative electrode active material particles and fine sulfide-based solid electrolyte particles; and the ratio of the average particle diameter (ra) of the fine negative electrode active material particles to the average particle diameter (rs) of the fine sulfide-based solid electrolyte particles, namely ra/rs is 2.0 or more.