Switching element and manufacturing method thereof

Switching element comprises a first electrode, a second electrode, and the ion-conducting portions, and a buffer portion. The first electrode can supply metal ions. Ion conductive portion is in contact with the first electrode and the second electrode comprises a metal ion inside a movable ion conductivity thereof. Buffers have a hardness less than the ion conductor is disposed along the ion conductive portion between the first electrode and the second electrode. The potential difference between the first electrode and the second electrode, by a metal between the first electrode and the second electrode is deposited or dissolved, the electrical characteristics are switched.