All solid battery

An all solid battery comprising:

• a multilayer chip in which each of a plurality of solid electrolyte layers and each of a plurality of electrodes are alternately stacked, a main component of the solid electrolyte layers being phosphoric acid salt-based solid electrolyte, the multilayer chip having a rectangular parallelepiped shape, the plurality of electrodes being alternately exposed to a first end face and a second end face of the multilayer chip, the first end face facing with the second end face,
• a first external electrode provided on the first end face so as to directly cover the first end face;
• a second external electrode provided on the second end face so as to directly cover the second end face;
• and
• wherein L/W is 0.20 or more and 0.60 or less and (L+W)/T is 15.0 or more and 30.0 or less, when a length of the multilayer chip in a first direction in which the first end face faces with the second end face is L, and a width of the multilayer chip in a second direction that is perpendicular to the first direction and a stacking direction of the multilayer chip is W, and T is a thickness of the multilayer chip in the stacking direction.