An all-solid-state battery has a positive electrode layer, a separator layer and a negative electrode layer. The all-solid-state battery satisfies relationships of “Formula (1): 0.99≤Sa0/Sc0≤1.01,” “Formula (2): 1.00≤Sa1/Sa0≤1.13,” and “Formula (3): 0.93≤Sc1/Sc0≤1.02.” Sc0 indicates an area of the positive electrode layer when the SOC is 0%. Sc1 indicates an area of the positive electrode layer when the SOC is 100%. Sa0 indicates an area of the negative electrode layer when the SOC is 0%. Sa1 indicates an area of the negative electrode layer when the SOC is 100%.