SOLID-STATE BATTERY

A solid-state battery including: a battery element including: a positive electrode including a positive electrode active material part, and a negative electrode; a positive external terminal in contact with the positive electrode; and a negative external terminal in contact with the negative electrode, wherein the battery element further includes a first electrode enclosure part surrounding a portion other than a first contact portion between the positive external terminal and the positive electrode, at least the positive electrode contains a first solid electrolyte containing lithium and halogen, the first electrode enclosure part includes at least a first region interposed between the positive electrode and the negative external terminal, the first region contains lithium and a second solid electrolyte containing halogen or not containing halogen, and an element ratio (%) of halogen to the lithium of the second solid electrolyte in the first region is 0% to 6%.