According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer and a current collector. The active material-containing layer comprises a first edge having an arc shape and a second edge positioned opposite to the first edge. The current collector comprises an active material-supporting section supporting the active material-containing layer, and an active material-non-supporting section. The curving amount is represented by a maximum distance from the first edge to a reference line connecting two points on the first edge. The curving amount is in a range of −1 mm or more and less than 0 mm.