The invention provides a battery capable of avoiding separation of solids in an electrode so as to prevent inactivation. The battery is characterized in that a first aqueous electrolyte layer and a positive electrode are arranged in order on one side of an anion conductor, and a second aqueous electrolyte layer and a negative electrode are disposed in order on the other side of the anion conductor. In addition, the negative electrode contains a negative active material layer which contains a negative active material layer capable of releasing metal ions during discharging.