The present invention relates to an all-solid battery, including a cathode, an anode, and a solid electrolyte layer. The solid electrolyte layer may include a first solid electrolyte having an ionic conductivity ranging from greater than about 5*10-3 S/cm to about 1*10-1 S/cm and a second solid electrolyte having an ionic conductivity ranging from greater than about 5*10-4 S/cm to about 1*10-2 S/cm.