All-solid battery and production method for same

An all-solid battery comprising:

• a cathode current collector;
• a cathode layer that contains cathode active materials constituted by a plurality of particles and first solid electrolytes constituted by a plurality of particles;
• a solid-electrolyte layer that contains third solid electrolytes;
• an anode layer that contains anode active materials and second solid electrolytes;
• and
• an anode current collector,
• the cathode current collector, the cathode layer, the solid-electrolyte layer, the anode layer, and the anode current collector being stacked in this order, wherein the cathode layer includes a region where the plurality of particles constituting the first solid electrolytes are filled or continuously densely packed in a sliced surface of the cathode layer in a case where an end of the cathode layer is sliced, and
• a distance between two adjacent particles having a positional relationship across the region among the plurality of particles constituting the cathode active materials is 2 times or more than an average particle size of the cathode active materials.