An electrical storage device , comprising: an electrode assembly in which positive electrodes and negative electrodes are alternately stacked with separators each interposed between the positive electrode and the negative electrode ; a bottomed cylindrical outer can in which the electrode assembly is housed; a sealing plate to which a positive electrode terminal and a negative electrode terminal are attached and that closes an opening of the outer can ; and a functional component that is arranged close to the positive electrode terminal or the negative electrode terminal on an inner surface of the sealing plate , wherein the positive electrode includes a positive electrode tab to be electrically connected with the positive electrode terminal , the negative electrode includes a negative electrode tab to be electrically connected with the negative electrode terminal , the electrode assembly has a positive electrode tab group formed by stacking a plurality of the positive electrode tabs , and a negative electrode tab group formed by stacking a plurality of the negative electrode tabs , in which each of the tab groups functions as a spring for connecting the electrode assembly and the sealing plate , and a spring constant of one tab group close to the functional component , of the positive electrode tab group and the negative electrode tab group , is greater than a spring constant of the other tab group ; wherein a ratio (K/k) of a spring constant K of the one tab group to a spring constant k of the other tab group satisfies a relationship of 2.5 ≤ K/k ≤ 7.5; where the spring constant is measured as indicated in the description. an electrode assembly in which positive electrodes and negative electrodes are alternately stacked with separators each interposed between the positive electrode and the negative electrode ; a bottomed cylindrical outer can in which the electrode assembly is housed; a sealing plate to which a positive electrode terminal and a negative electrode terminal are attached and that closes an opening of the outer can ; and a functional component that is arranged close to the positive electrode terminal or the negative electrode terminal on an inner surface of the sealing plate , wherein the positive electrode includes a positive electrode tab to be electrically connected with the positive electrode terminal , the negative electrode includes a negative electrode tab to be electrically connected with the negative electrode terminal , the electrode assembly has a positive electrode tab group formed by stacking a plurality of the positive electrode tabs , and a negative electrode tab group formed by stacking a plurality of the negative electrode tabs , in which each of the tab groups functions as a spring for connecting the electrode assembly and the sealing plate , and a spring constant of one tab group close to the functional component , of the positive electrode tab group and the negative electrode tab group , is greater than a spring constant of the other tab group ; wherein a ratio (K/k) of a spring constant K of the one tab group to a spring constant k of the other tab group satisfies a relationship of 2.5 ≤ K/k ≤ 7.5; where the spring constant is measured as indicated in the description. <EOS>