A semiconductor solid state battery has an insulating layer provided between an N-type semiconductor and a P-type semiconductor. The first insulating layer preferably has a thickness of 3 nm to 30 μm and a dielectric constant of 10 or less. The first insulating layer preferably has a density of 60% or more of a bulk body. The semiconductor layer preferably has a capture level introduced. The semiconductor solid state battery can eliminate leakage of an electrolyte solution.