According to one embodiment, an electrode group is provided. The electrode group includes a positive electrode including a positive electrode active material-containing layer and a negative electrode including 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. At least a part of the negative electrode active material-containing layer faces at least a part of the positive electrode active material-containing layer. The electrode group satisfies the following formula: 6500 ≤ A / B ≤ 18500 , where A is an area [cm 2 ] 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.