All solid battery and manufacturing method of the same

A manufacturing method of an all solid battery comprising:

• preparing a multilayer structure in which a paste for a first electrode layer including an active material is provided on a first main face of a green sheet including Li—Al-M-PO4-based phosphoric acid salt powder, and a paste for a second electrode layer including an active material is provided on a second main face of the green sheet;
• and
• firing the multilayer structure,
• wherein “M” is at least one of Ge, Ti and Zr,
• wherein a region in which a ratio of MO2 with respect to Li—Al-M-PO4 is 5% or more is unevenly distributed from a center in a thickness of a solid electrolyte layer formed by firing the green sheet to 0.4 A downward and to 0.4 A upward when the thickness of the solid electrolyte layer is expressed by “A”, by adding MO2 particles in the green sheet and adjusting a condition of the firing.