According to one embodiment, an electrode group is provided. The electrode group includes a positive electrode active material-containing layer and a negative electrode active material-containing layer. The negative electrode active material-containing layer contains at least one titanium-containing composite oxide selected from the group consisting of a monoclinic niobium titanium composite oxide and an orthorhombic titanium-containing composite oxide. The electrode group satisfies the following formula:

6500≤A/B≤18500,



where A is an area [cm2] of a portion of the negative electrode active material-containing layer that faces the positive electrode active material-containing layer, and B is a thickness [cm] of the electrode group.