All solid battery and manufacturing method of the same

An all solid battery comprising:

• a solid electrolyte layer including a glass component, a main component of the solid electrolyte layer being phosphoric acid salt-based solid electrolyte;
• and
• electrode layers that are provided on both main faces of the solid electrolyte layer,
• wherein the electrode layers include an electrode active material and a carbon material, the electrode active material being different from the carbon material, the carbon material acting as a conductive auxiliary agent and having an average particle diameter of 40 nm or more and 120 nm or less,
• wherein a DBP oil absorption of the carbon material is 200 mL/100 g or less,
• wherein a ratio of the carbon material in the electrode layers is 5 vol % or more and 60 vol % or less,
• wherein the electrode active material of one of the electrode layers has the same chemical composition as that of the other of the electrode layers,
• wherein the solid electrolyte layer and the electrode layers have a sintered structure, and
• wherein when a true density of the solid electrolyte before sintering is 100%, a density degree of only the solid electrolyte of the sintered structure is 90% or more, and an electrical conductivity (S/cm) of the sintered structure is 0.1 or more.