According to one embodiment, an active material includes a monoclinic system β-type titanium composite oxide. The monoclinic system β-type titanium composite oxide includes a first element including at least one of Mo and W and satisfies the following formula (1): B>A  (1) In the formula, A is an intensity of a peak which is derived from (110) plane of the monoclinic system β-type titanium composite oxide in a wide-angle X-ray diffraction pattern. B is an intensity of a peak which is derived from (002) plane of the monoclinic system β-type titanium composite oxide in the wide-angle X-ray diffraction pattern.