According to one embodiment, provided is an active material including a crystal particle that includes a niobium-titanium composite oxide. A ratio ANb/ATi of a Nb abundance ANb to a Ti abundance ATi in the crystal particle satisfies 2.3≤ANb/ATi≤4.0. According to a powder X-ray diffraction spectrum using a Cu-Kα ray for the crystal particle, an intensity ratio Iβ/Iα of a peak intensity Iβ of a peak β appearing at 12.5°≤2θ≤13.0° to a peak intensity Iα of a peak α appearing at 8.5°≤2θ≤9.0° is within a range of 0.1