ALL-SOLID BATTERY

This all-solid-state battery includes: a laminate; a positive electrode-side external electrode; and a negative electrode-side external electrode, in which the laminate includes a positive electrode layer and a negative electrode layer, in a plan view from a lamination direction of the laminate, the positive electrode layer includes a positive electrode main portion and a positive electrode auxiliary portion which protrudes from the positive electrode main portion and reaches a side surface, the negative electrode layer includes a negative electrode main portion and a negative electrode auxiliary portion which protrudes from the negative electrode main portion and reaches the side surface, and a length Lof the positive electrode auxiliary portion on the side surface, a length Lof the negative electrode auxiliary portion on the side surface, and a length Lon the side surface satisfy a relation of 20 μm≤(L+L)